diff --git a/blockly_compressed.js b/blockly_compressed.js
index 8337ed485..3a5ae9115 100644
--- a/blockly_compressed.js
+++ b/blockly_compressed.js
@@ -859,7 +859,7 @@ goog.ui.tree.TreeControl.prototype.handleMouseEvent_=function(a){goog.log.fine(t
 goog.ui.tree.TreeControl.prototype.handleKeyEvent=function(a){var b;(b=this.typeAhead_.handleNavigation(a)||this.selectedItem_&&this.selectedItem_.onKeyDown(a)||this.typeAhead_.handleTypeAheadChar(a))&&a.preventDefault();return b};goog.ui.tree.TreeControl.prototype.getNodeFromEvent_=function(a){for(var b=a.target;null!=b;){if(a=goog.ui.tree.BaseNode.allNodes[b.id])return a;if(b==this.getElement())break;b=b.parentNode}return null};
 goog.ui.tree.TreeControl.prototype.createNode=function(a){return new goog.ui.tree.TreeNode(a||goog.html.SafeHtml.EMPTY,this.getConfig(),this.getDomHelper())};goog.ui.tree.TreeControl.prototype.setNode=function(a){this.typeAhead_.setNodeInMap(a)};goog.ui.tree.TreeControl.prototype.removeNode=function(a){this.typeAhead_.removeNodeFromMap(a)};goog.ui.tree.TreeControl.prototype.clearTypeAhead=function(){this.typeAhead_.clear()};goog.ui.tree.TreeControl.defaultConfig=goog.ui.tree.BaseNode.defaultConfig;
 // Copyright 2013 Google Inc.  Apache License 2.0
-var Blockly={Blocks:{}};
+var Blockly={Blocks:{}};Blockly.Blocks.ONE_BASED_INDEXING=!0;
 // Copyright 2012 Google Inc.  Apache License 2.0
 Blockly.Workspace=function(a){this.id=Blockly.genUid();Blockly.Workspace.WorkspaceDB_[this.id]=this;this.options=a||{};this.RTL=!!this.options.RTL;this.horizontalLayout=!!this.options.horizontalLayout;this.toolboxPosition=this.options.toolboxPosition;this.topBlocks_=[];this.listeners_=[];this.undoStack_=[];this.redoStack_=[];this.blockDB_=Object.create(null)};Blockly.Workspace.prototype.rendered=!1;Blockly.Workspace.prototype.MAX_UNDO=1024;
 Blockly.Workspace.prototype.dispose=function(){this.listeners_.length=0;this.clear();delete Blockly.Workspace.WorkspaceDB_[this.id]};Blockly.Workspace.SCAN_ANGLE=3;Blockly.Workspace.prototype.addTopBlock=function(a){this.topBlocks_.push(a)};Blockly.Workspace.prototype.removeTopBlock=function(a){for(var b=!1,c,d=0;c=this.topBlocks_[d];d++)if(c==a){this.topBlocks_.splice(d,1);b=!0;break}if(!b)throw"Block not present in workspace's list of top-most blocks.";};
diff --git a/blocks/lists.js b/blocks/lists.js
index af0f6624a..7662209f7 100644
--- a/blocks/lists.js
+++ b/blocks/lists.js
@@ -300,7 +300,9 @@ Blockly.Blocks['lists_indexOf'] = {
     this.appendValueInput('FIND')
         .appendField(new Blockly.FieldDropdown(OPERATORS), 'END');
     this.setInputsInline(true);
-    this.setTooltip(Blockly.Msg.LISTS_INDEX_OF_TOOLTIP);
+    var tooltip = Blockly.Msg.LISTS_INDEX_OF_TOOLTIP
+        .replace('%1', Blockly.Blocks.ONE_BASED_INDEXING ? '0' : '-1');
+    this.setTooltip(tooltip);
   }
 };
 
diff --git a/blocks/text.js b/blocks/text.js
index 030940add..23ff52b32 100644
--- a/blocks/text.js
+++ b/blocks/text.js
@@ -322,7 +322,9 @@ Blockly.Blocks['text_indexOf'] = {
       this.appendDummyInput().appendField(Blockly.Msg.TEXT_INDEXOF_TAIL);
     }
     this.setInputsInline(true);
-    this.setTooltip(Blockly.Msg.TEXT_INDEXOF_TOOLTIP);
+    var tooltip = Blockly.Msg.TEXT_INDEXOF_TOOLTIP
+        .replace('%1', Blockly.Blocks.ONE_BASED_INDEXING ? '0' : '-1');
+    this.setTooltip(tooltip);
   }
 };
 
diff --git a/blocks_compressed.js b/blocks_compressed.js
index 7c9504022..ac90b8c71 100644
--- a/blocks_compressed.js
+++ b/blocks_compressed.js
@@ -18,7 +18,8 @@ Blockly.Blocks.lists_create_with_item={init:function(){this.setColour(Blockly.Bl
 Blockly.Blocks.lists_repeat={init:function(){this.jsonInit({message0:Blockly.Msg.LISTS_REPEAT_TITLE,args0:[{type:"input_value",name:"ITEM"},{type:"input_value",name:"NUM",check:"Number"}],output:"Array",colour:Blockly.Blocks.lists.HUE,tooltip:Blockly.Msg.LISTS_REPEAT_TOOLTIP,helpUrl:Blockly.Msg.LISTS_REPEAT_HELPURL})}};
 Blockly.Blocks.lists_length={init:function(){this.jsonInit({message0:Blockly.Msg.LISTS_LENGTH_TITLE,args0:[{type:"input_value",name:"VALUE",check:["String","Array"]}],output:"Number",colour:Blockly.Blocks.lists.HUE,tooltip:Blockly.Msg.LISTS_LENGTH_TOOLTIP,helpUrl:Blockly.Msg.LISTS_LENGTH_HELPURL})}};
 Blockly.Blocks.lists_isEmpty={init:function(){this.jsonInit({message0:Blockly.Msg.LISTS_ISEMPTY_TITLE,args0:[{type:"input_value",name:"VALUE",check:["String","Array"]}],output:"Boolean",colour:Blockly.Blocks.lists.HUE,tooltip:Blockly.Msg.LISTS_ISEMPTY_TOOLTIP,helpUrl:Blockly.Msg.LISTS_ISEMPTY_HELPURL})}};
-Blockly.Blocks.lists_indexOf={init:function(){var a=[[Blockly.Msg.LISTS_INDEX_OF_FIRST,"FIRST"],[Blockly.Msg.LISTS_INDEX_OF_LAST,"LAST"]];this.setHelpUrl(Blockly.Msg.LISTS_INDEX_OF_HELPURL);this.setColour(Blockly.Blocks.lists.HUE);this.setOutput(!0,"Number");this.appendValueInput("VALUE").setCheck("Array").appendField(Blockly.Msg.LISTS_INDEX_OF_INPUT_IN_LIST);this.appendValueInput("FIND").appendField(new Blockly.FieldDropdown(a),"END");this.setInputsInline(!0);this.setTooltip(Blockly.Msg.LISTS_INDEX_OF_TOOLTIP)}};
+Blockly.Blocks.lists_indexOf={init:function(){var a=[[Blockly.Msg.LISTS_INDEX_OF_FIRST,"FIRST"],[Blockly.Msg.LISTS_INDEX_OF_LAST,"LAST"]];this.setHelpUrl(Blockly.Msg.LISTS_INDEX_OF_HELPURL);this.setColour(Blockly.Blocks.lists.HUE);this.setOutput(!0,"Number");this.appendValueInput("VALUE").setCheck("Array").appendField(Blockly.Msg.LISTS_INDEX_OF_INPUT_IN_LIST);this.appendValueInput("FIND").appendField(new Blockly.FieldDropdown(a),"END");this.setInputsInline(!0);a=Blockly.Msg.LISTS_INDEX_OF_TOOLTIP.replace("%1",
+Blockly.Blocks.ONE_BASED_INDEXING?"0":"-1");this.setTooltip(a)}};
 Blockly.Blocks.lists_getIndex={init:function(){var a=[[Blockly.Msg.LISTS_GET_INDEX_GET,"GET"],[Blockly.Msg.LISTS_GET_INDEX_GET_REMOVE,"GET_REMOVE"],[Blockly.Msg.LISTS_GET_INDEX_REMOVE,"REMOVE"]];this.WHERE_OPTIONS=[[Blockly.Msg.LISTS_GET_INDEX_FROM_START,"FROM_START"],[Blockly.Msg.LISTS_GET_INDEX_FROM_END,"FROM_END"],[Blockly.Msg.LISTS_GET_INDEX_FIRST,"FIRST"],[Blockly.Msg.LISTS_GET_INDEX_LAST,"LAST"],[Blockly.Msg.LISTS_GET_INDEX_RANDOM,"RANDOM"]];this.setHelpUrl(Blockly.Msg.LISTS_GET_INDEX_HELPURL);
 this.setColour(Blockly.Blocks.lists.HUE);a=new Blockly.FieldDropdown(a,function(a){this.sourceBlock_.updateStatement_("REMOVE"==a)});this.appendValueInput("VALUE").setCheck("Array").appendField(Blockly.Msg.LISTS_GET_INDEX_INPUT_IN_LIST);this.appendDummyInput().appendField(a,"MODE").appendField("","SPACE");this.appendDummyInput("AT");Blockly.Msg.LISTS_GET_INDEX_TAIL&&this.appendDummyInput("TAIL").appendField(Blockly.Msg.LISTS_GET_INDEX_TAIL);this.setInputsInline(!0);this.setOutput(!0);this.updateAt_(!0);
 var b=this;this.setTooltip(function(){var a=b.getFieldValue("MODE")+"_"+b.getFieldValue("WHERE");return Blockly.Msg["LISTS_GET_INDEX_TOOLTIP_"+a]})},mutationToDom:function(){var a=document.createElement("mutation");a.setAttribute("statement",!this.outputConnection);var b=this.getInput("AT").type==Blockly.INPUT_VALUE;a.setAttribute("at",b);return a},domToMutation:function(a){var b="true"==a.getAttribute("statement");this.updateStatement_(b);a="false"!=a.getAttribute("at");this.updateAt_(a)},updateStatement_:function(a){a!=
@@ -122,7 +123,7 @@ Blockly.Blocks.text_append={init:function(){this.setHelpUrl(Blockly.Msg.TEXT_APP
 Blockly.Blocks.text_length={init:function(){this.jsonInit({message0:Blockly.Msg.TEXT_LENGTH_TITLE,args0:[{type:"input_value",name:"VALUE",check:["String","Array"]}],output:"Number",colour:Blockly.Blocks.texts.HUE,tooltip:Blockly.Msg.TEXT_LENGTH_TOOLTIP,helpUrl:Blockly.Msg.TEXT_LENGTH_HELPURL})}};
 Blockly.Blocks.text_isEmpty={init:function(){this.jsonInit({message0:Blockly.Msg.TEXT_ISEMPTY_TITLE,args0:[{type:"input_value",name:"VALUE",check:["String","Array"]}],output:"Boolean",colour:Blockly.Blocks.texts.HUE,tooltip:Blockly.Msg.TEXT_ISEMPTY_TOOLTIP,helpUrl:Blockly.Msg.TEXT_ISEMPTY_HELPURL})}};
 Blockly.Blocks.text_indexOf={init:function(){var a=[[Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST,"FIRST"],[Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST,"LAST"]];this.setHelpUrl(Blockly.Msg.TEXT_INDEXOF_HELPURL);this.setColour(Blockly.Blocks.texts.HUE);this.setOutput(!0,"Number");this.appendValueInput("VALUE").setCheck("String").appendField(Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT);this.appendValueInput("FIND").setCheck("String").appendField(new Blockly.FieldDropdown(a),"END");Blockly.Msg.TEXT_INDEXOF_TAIL&&this.appendDummyInput().appendField(Blockly.Msg.TEXT_INDEXOF_TAIL);
-this.setInputsInline(!0);this.setTooltip(Blockly.Msg.TEXT_INDEXOF_TOOLTIP)}};
+this.setInputsInline(!0);a=Blockly.Msg.TEXT_INDEXOF_TOOLTIP.replace("%1",Blockly.Blocks.ONE_BASED_INDEXING?"0":"-1");this.setTooltip(a)}};
 Blockly.Blocks.text_charAt={init:function(){this.WHERE_OPTIONS=[[Blockly.Msg.TEXT_CHARAT_FROM_START,"FROM_START"],[Blockly.Msg.TEXT_CHARAT_FROM_END,"FROM_END"],[Blockly.Msg.TEXT_CHARAT_FIRST,"FIRST"],[Blockly.Msg.TEXT_CHARAT_LAST,"LAST"],[Blockly.Msg.TEXT_CHARAT_RANDOM,"RANDOM"]];this.setHelpUrl(Blockly.Msg.TEXT_CHARAT_HELPURL);this.setColour(Blockly.Blocks.texts.HUE);this.setOutput(!0,"String");this.appendValueInput("VALUE").setCheck("String").appendField(Blockly.Msg.TEXT_CHARAT_INPUT_INTEXT);this.appendDummyInput("AT");
 this.setInputsInline(!0);this.updateAt_(!0);this.setTooltip(Blockly.Msg.TEXT_CHARAT_TOOLTIP)},mutationToDom:function(){var a=document.createElement("mutation"),b=this.getInput("AT").type==Blockly.INPUT_VALUE;a.setAttribute("at",b);return a},domToMutation:function(a){a="false"!=a.getAttribute("at");this.updateAt_(a)},updateAt_:function(a){this.removeInput("AT");this.removeInput("ORDINAL",!0);a?(this.appendValueInput("AT").setCheck("Number"),Blockly.Msg.ORDINAL_NUMBER_SUFFIX&&this.appendDummyInput("ORDINAL").appendField(Blockly.Msg.ORDINAL_NUMBER_SUFFIX)):
 this.appendDummyInput("AT");Blockly.Msg.TEXT_CHARAT_TAIL&&(this.removeInput("TAIL",!0),this.appendDummyInput("TAIL").appendField(Blockly.Msg.TEXT_CHARAT_TAIL));var b=new Blockly.FieldDropdown(this.WHERE_OPTIONS,function(b){var d="FROM_START"==b||"FROM_END"==b;if(d!=a){var e=this.sourceBlock_;e.updateAt_(d);e.setFieldValue(b,"WHERE");return null}});this.getInput("AT").appendField(b,"WHERE")}};
diff --git a/core/blocks.js b/core/blocks.js
index 606ef3f0b..aa863e8b2 100644
--- a/core/blocks.js
+++ b/core/blocks.js
@@ -25,3 +25,10 @@
 'use strict';
 
 goog.provide('Blockly.Blocks');
+
+/**
+ * Allow for switching between one and zero based indexing for lists and text,
+ * one based by default.
+ */
+Blockly.Blocks.ONE_BASED_INDEXING = true;
+
diff --git a/msg/js/ar.js b/msg/js/ar.js
index cc28e2e97..230d1435b 100644
--- a/msg/js/ar.js
+++ b/msg/js/ar.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "يقوم بإنشاء نسخة من ا
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "ابحث على على التواجد الأول للعنصر";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "ابحث على التواجد الأخير للعنصر";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "تقوم بإرجاع مؤشر التواجد  الأول/الأخير في القائمة.  تقوم بإرجاع 0 إذا لم يتم العثور على النص.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "تقوم بإرجاع مؤشر التواجد  الأول/الأخير في القائمة.  تقوم بإرجاع %1 إذا لم يتم العثور على النص.";
 Blockly.Msg.LISTS_INLIST = "في قائمة";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 فارغ";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "في النص";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "ابحث عن التواجد الأول للنص";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "ابحث عن التواجد الأخير للنص";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "تقوم بإرجاع مؤشر التواجد الأول/الأخير للنص الأول في النص الثاني.  تقوم بإرجاع 0 إذا لم يتم العثور على النص.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "تقوم بإرجاع مؤشر التواجد الأول/الأخير للنص الأول في النص الثاني.  تقوم بإرجاع %1 إذا لم يتم العثور على النص.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 فارغ";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "يرجع \"صحيح\" إذا كان النص المقدم فارغ.";
diff --git a/msg/js/az.js b/msg/js/az.js
index 7df8892e3..421a7281f 100644
--- a/msg/js/az.js
+++ b/msg/js/az.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Siyahının təyin olunmuş hissəsinin
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "Element ilə ilk rastlaşma indeksini müəyyən edin";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "Element ilə son rastlaşma indeksini müəyyən edin";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Siyahıda element ilə ilk/son rastlaşma indeksini qaytarır. Əgər tekst siyahıda tapılmazsa, 0 qaytarılır.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Siyahıda element ilə ilk/son rastlaşma indeksini qaytarır. Əgər tekst siyahıda tapılmazsa, %1 qaytarılır.";
 Blockly.Msg.LISTS_INLIST = "siyahıda";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 boşdur";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "mətndə";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "Bu mətn ilə ilk rastlaşmanı tap:";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "Bu mətn ilə son rastlaşmanı tap:";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Birinci mətnin ikinci mətndə ilk/son rastlaşma indeksini qaytarır. Əgər rastlaşma baş verməzsə, 0 qaytarır.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Birinci mətnin ikinci mətndə ilk/son rastlaşma indeksini qaytarır. Əgər rastlaşma baş verməzsə, %1 qaytarır.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 boşdur";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Verilmiş mətn boşdursa, doğru qiymətini qaytarır.";
diff --git a/msg/js/ba.js b/msg/js/ba.js
index 48f7ee4a7..d47472ea1 100644
--- a/msg/js/ba.js
+++ b/msg/js/ba.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creates a copy of the specified portion
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "find first occurrence of item";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "find last occurrence of item";  // untranslated
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.";  // untranslated
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.";  // untranslated
 Blockly.Msg.LISTS_INLIST = "исемлеккә";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 буш";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "текстҡа";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "текстың тәүге инеүен табырға";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "Текстың һуңғы инеүен табырға";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 буш";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";  // untranslated
diff --git a/msg/js/bcc.js b/msg/js/bcc.js
index a584c8a4e..f5e7a9614 100644
--- a/msg/js/bcc.js
+++ b/msg/js/bcc.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "کپی از قسمت مشخص‌شده
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "آخرین رخداد متن را بیاب";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "یافتن آخرین رخ‌داد مورد";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. ۰ بر می‌گرداند اگر متن موجود نبود.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. %1 بر می‌گرداند اگر متن موجود نبود.";
 Blockly.Msg.LISTS_INLIST = "در فهرست";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 خالی است";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "در متن";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "اولین رخداد متن را بیاب";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "آخرین رخداد متن را بیاب";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد ۰ باز می‌گرداند.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد %1 باز می‌گرداند.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 خالی است";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "اضافه‌کردن صحیح اگر متن فراهم‌شده خالی است.";
diff --git a/msg/js/be-tarask.js b/msg/js/be-tarask.js
index 5380de17b..b2ed711e7 100644
--- a/msg/js/be-tarask.js
+++ b/msg/js/be-tarask.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Стварае копію пазнач
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "знайсьці першае ўваходжаньне элемэнту";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "знайсьці апошняе ўваходжаньне элемэнту";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Вяртае індэкс першага/апошняга ўваходжаньня элемэнту ў сьпіс. Вяртае 0, калі элемэнт ня знойдзены.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Вяртае індэкс першага/апошняга ўваходжаньня элемэнту ў сьпіс. Вяртае %1, калі элемэнт ня знойдзены.";
 Blockly.Msg.LISTS_INLIST = "у сьпісе";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 пусты";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "у тэксьце";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "знайсьці першае ўваходжаньне тэксту";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "знайсьці апошняе ўваходжаньне тэксту";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Вяртае індэкс першага/апошняга ўваходжаньня першага тэксту ў другі тэкст. Вяртае 0, калі тэкст ня знойдзены.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Вяртае індэкс першага/апошняга ўваходжаньня першага тэксту ў другі тэкст. Вяртае %1, калі тэкст ня знойдзены.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 пусты";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Вяртае значэньне ісьціна, калі тэкст пусты.";
diff --git a/msg/js/bg.js b/msg/js/bg.js
index 505dce432..7dde716a1 100644
--- a/msg/js/bg.js
+++ b/msg/js/bg.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Копира част от списък
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "намери първата поява на елемента";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "намери последната поява на елемента";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Връща индекса на първото/последното появяване на елемента в списъка. Връща 0 ако елементът не е намерен.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Връща индекса на първото/последното появяване на елемента в списъка. Връща %1 ако елементът не е намерен.";
 Blockly.Msg.LISTS_INLIST = "в списъка";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 е празен";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "в текста";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "намери първата поява на текста";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "намери последната поява на текста";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Връща индекса на първото/последното срещане на първия текст във втория текст. Връща 0, ако текстът не е намерен.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Връща индекса на първото/последното срещане на първия текст във втория текст. Връща %1, ако текстът не е намерен.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 е празен";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Връща истина, ако текста е празен.";
diff --git a/msg/js/bn.js b/msg/js/bn.js
index 45bda37d7..65a1c835c 100644
--- a/msg/js/bn.js
+++ b/msg/js/bn.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creates a copy of the specified portion
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "আইটেমের প্রথম সংঘটন খুঁজুন";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "আইটেমের শেষ সংঘটন খুঁজুন";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.";  // untranslated
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.";  // untranslated
 Blockly.Msg.LISTS_INLIST = "তালিকার মধ্যে";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 খালি";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "in text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "find first occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "find last occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 খালি";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "পাঠাবে সত্য যদি সরবরাহকৃত লেখাটি খালি হয়।";
diff --git a/msg/js/br.js b/msg/js/br.js
index 54bbe8a1e..398a3e48e 100644
--- a/msg/js/br.js
+++ b/msg/js/br.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Krouiñ un eilad eus lodenn spisaet ul
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "kavout reveziadenn gentañ un elfenn";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "kavout reveziadenn diwezhañ un elfenn";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Distreiñ meneger ar c'hentañ/an eil reveziadenn eus an elfenn en ul listenn. Distreiñ 0 ma n'eo ket kavet an destenn.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Distreiñ meneger ar c'hentañ/an eil reveziadenn eus an elfenn en ul listenn. Distreiñ %1 ma n'eo ket kavet an destenn.";
 Blockly.Msg.LISTS_INLIST = "el listenn";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 zo goullo";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "en destenn";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "kavout reveziadenn gentañ an destenn";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "kavout reveziadenn diwezhañ an destenn";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Distreiñ meneger ar c'hentañ/an eil reveziadenn eus ar chadenn gentañ en eil chadenn. Distreiñ 0 ma n'eo ket kavet ar chadenn.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Distreiñ meneger ar c'hentañ/an eil reveziadenn eus ar chadenn gentañ en eil chadenn. Distreiñ %1 ma n'eo ket kavet ar chadenn.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 zo goullo";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Adkas gwir m'eo goullo an destenn roet.";
diff --git a/msg/js/ca.js b/msg/js/ca.js
index 8d5bd5aec..27887e9cc 100644
--- a/msg/js/ca.js
+++ b/msg/js/ca.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Crea una còpia de la part especificada
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "buscar primera aparició d'un element";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "buscar última aparició d'un element";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Retorna l'índex de la primera/última aparició d'un element a la llista. Retorna 0 si no s'hi troba el text.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Retorna l'índex de la primera/última aparició d'un element a la llista. Retorna %1 si no s'hi troba el text.";
 Blockly.Msg.LISTS_INLIST = "en la llista";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 és buida";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "en el text";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "trobar la primera aparició del text";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "trobar l'última aparició del text";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Retorna l'índex de la primera/última aparició del primer text dins el segon. Retorna 0 si no es troba el text.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Retorna l'índex de la primera/última aparició del primer text dins el segon. Retorna %1 si no es troba el text.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 està buit";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Retorna cert si el text proporcionat està buit.";
diff --git a/msg/js/cs.js b/msg/js/cs.js
index 9fcb97f82..ac10ebe54 100644
--- a/msg/js/cs.js
+++ b/msg/js/cs.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Vytvoří kopii určené části seznam
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "najít první výskyt položky";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "najít poslední výskyt položky";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Vrací index prvního/posledního výskytu položky v seznamu. Vrací 0, pokud položka nebyla nalezena.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Vrací index prvního/posledního výskytu položky v seznamu. Vrací %1, pokud položka nebyla nalezena.";
 Blockly.Msg.LISTS_INLIST = "v seznamu";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 je prázdné";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "v textu";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "najít první výskyt textu";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "najít poslední výskyt textu";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Vrátí index prvního/posledního výskytu prvního textu v druhém textu.  Pokud text není nalezen, vrátí hodnotu 0.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Vrátí index prvního/posledního výskytu prvního textu v druhém textu.  Pokud text není nalezen, vrátí hodnotu %1.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 je prázdný";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Vrátí pravda pokud je zadaný text prázdný.";
diff --git a/msg/js/da.js b/msg/js/da.js
index f64d3d907..7fe69e282 100644
--- a/msg/js/da.js
+++ b/msg/js/da.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Opretter en kopi af den angivne del af
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "find første forekomst af elementet";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "find sidste forekomst af elementet";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returnerer indeks for første/sidste forekomst af elementet i listen. Returnerer 0, hvis elementet ikke kan findes.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returnerer indeks for første/sidste forekomst af elementet i listen. Returnerer %1, hvis elementet ikke kan findes.";
 Blockly.Msg.LISTS_INLIST = "i listen";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 er tom";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "i teksten";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "find første forekomst af teksten";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "find sidste forekomst af teksten";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returnerer indeks for første/sidste forekomst af første tekst i den anden tekst.  Returnerer 0, hvis teksten ikke kan findes.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returnerer indeks for første/sidste forekomst af første tekst i den anden tekst.  Returnerer %1, hvis teksten ikke kan findes.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 er tom";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returnerer sand, hvis den angivne tekst er tom.";
diff --git a/msg/js/de.js b/msg/js/de.js
index dbd1822f6..4973e1143 100644
--- a/msg/js/de.js
+++ b/msg/js/de.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Erstellt eine Kopie mit dem angegebenen
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "suche erstes Auftreten von";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "http://publib.boulder.ibm.com/infocenter/lnxpcomp/v8v101/index.jsp?topic=%2Fcom.ibm.xlcpp8l.doc%2Flanguage%2Fref%2Farsubex.htm";
 Blockly.Msg.LISTS_INDEX_OF_LAST = "suche letztes Auftreten von";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Sucht die Position (Index) eines Elementes in der Liste. Gibt 0 zurück, falls kein Element gefunden wurde.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Sucht die Position (Index) eines Elementes in der Liste. Gibt %1 zurück, falls kein Element gefunden wurde.";
 Blockly.Msg.LISTS_INLIST = "in der Liste";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 ist leer";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "im Text";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "suche erstes Auftreten des Begriffs";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "suche letztes Auftreten des Begriffs";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Findet das erste / letzte Auftreten eines Suchbegriffs in einem Text.  Gibt die Position des Begriffs zurück oder 0 falls der Suchbegriff nicht gefunden wurde.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Findet das erste / letzte Auftreten eines Suchbegriffs in einem Text.  Gibt die Position des Begriffs zurück oder %1 falls der Suchbegriff nicht gefunden wurde.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 ist leer";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Ist wahr, falls der Text keine Zeichen enthält ist.";
diff --git a/msg/js/el.js b/msg/js/el.js
index f7c3dd827..006fa920f 100644
--- a/msg/js/el.js
+++ b/msg/js/el.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Δημιουργεί ένα αντίγ
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "βρες την πρώτη εμφάνιση του στοιχείου";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "Blockly";
 Blockly.Msg.LISTS_INDEX_OF_LAST = "βρες την τελευταία εμφάνιση του στοιχείου";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Επιστρέφει τον δείκτη της πρώτης/τελευταίας εμφάνισης του στοιχείου στη λίστα.  Επιστρέφει τιμή 0, αν το στοιχείο δεν βρεθεί.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Επιστρέφει τον δείκτη της πρώτης/τελευταίας εμφάνισης του στοιχείου στη λίστα.  Επιστρέφει τιμή %1, αν το στοιχείο δεν βρεθεί.";
 Blockly.Msg.LISTS_INLIST = "στη λίστα";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "το %1 είναι κενό";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "στο κείμενο";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "βρες την πρώτη εμφάνιση του κειμένου";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "βρες την τελευταία εμφάνιση του κειμένου";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Επιστρέφει τον δείκτη της πρώτης/τελευταίας εμφάνισης του πρώτου κειμένου στο δεύτερο κείμενο.  Επιστρέφει τιμή 0, αν δε βρει το κείμενο.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Επιστρέφει τον δείκτη της πρώτης/τελευταίας εμφάνισης του πρώτου κειμένου στο δεύτερο κείμενο.  Επιστρέφει τιμή %1, αν δε βρει το κείμενο.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "το %1 είναι κενό";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Επιστρέφει αληθής αν το παρεχόμενο κείμενο είναι κενό.";
diff --git a/msg/js/en.js b/msg/js/en.js
index 6c586caa3..8b02cfdd2 100644
--- a/msg/js/en.js
+++ b/msg/js/en.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creates a copy of the specified portion
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "find first occurrence of item";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";
 Blockly.Msg.LISTS_INDEX_OF_LAST = "find last occurrence of item";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.";
 Blockly.Msg.LISTS_INLIST = "in list";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 is empty";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "in text";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "find first occurrence of text";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "find last occurrence of text";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 is empty";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";
diff --git a/msg/js/es.js b/msg/js/es.js
index 913489e0f..302819a06 100644
--- a/msg/js/es.js
+++ b/msg/js/es.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Crea una copia de la parte especificada
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "encontrar la primera aparición del elemento";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "encontrar la última aparición del elemento";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Devuelve el índice de la primera/última aparición del elemento en la lista. Devuelve 0 si el elemento no se encuentra.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Devuelve el índice de la primera/última aparición del elemento en la lista. Devuelve %1 si el elemento no se encuentra.";
 Blockly.Msg.LISTS_INLIST = "en la lista";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 está vacía";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "en el texto";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "encontrar la primera aparición del texto";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "encontrar la última aparición del texto";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Devuelve el índice de la primera/última aparición del primer texto en el segundo texto. Devuelve 0 si el texto no se encuentra.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Devuelve el índice de la primera/última aparición del primer texto en el segundo texto. Devuelve %1 si el texto no se encuentra.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 está vacío";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Devuelve verdadero si el texto proporcionado está vacío.";
diff --git a/msg/js/fa.js b/msg/js/fa.js
index c6c447467..d7df50865 100644
--- a/msg/js/fa.js
+++ b/msg/js/fa.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "کپی از قسمت مشخص‌شده
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "یافتن اولین رخ‌داد مورد";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "یافتن آخرین رخ‌داد مورد";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. ۰ بر می‌گرداند اگر آیتم موجود نبود.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. %1 بر می‌گرداند اگر آیتم موجود نبود.";
 Blockly.Msg.LISTS_INLIST = "در فهرست";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 خالی است";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "در متن";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "اولین رخداد متن را بیاب";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "آخرین رخداد متن را بیاب";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد ۰ باز می‌گرداند.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد %1 باز می‌گرداند.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 خالی است";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "اضافه‌کردن صحیح اگر متن فراهم‌شده خالی است.";
diff --git a/msg/js/fi.js b/msg/js/fi.js
index 62c8c6fc3..e2d48da1d 100644
--- a/msg/js/fi.js
+++ b/msg/js/fi.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Luo kopio määrätystä kohden listaa.
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "etsi ensimmäinen esiintymä kohteelle";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "etsi viimeinen esiintymä kohteelle";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Palauttaa kohteen ensimmäisen/viimeisen esiintymän kohdan. Palauttaa 0 jos tekstiä ei löydy.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Palauttaa kohteen ensimmäisen/viimeisen esiintymän kohdan. Palauttaa %1 jos tekstiä ei löydy.";
 Blockly.Msg.LISTS_INLIST = "listassa";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 on tyhjä";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "tekstistä";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "etsi ensimmäinen esiintymä merkkijonolle";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "etsi viimeinen esiintymä merkkijonolle";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Palauttaa ensin annetun tekstin ensimmäisen/viimeisen esiintymän osoitteen toisessa tekstissä. Palauttaa osoitteen 0 jos tekstiä ei löytynyt.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Palauttaa ensin annetun tekstin ensimmäisen/viimeisen esiintymän osoitteen toisessa tekstissä. Palauttaa osoitteen %1 jos tekstiä ei löytynyt.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 on tyhjä";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Palauttaa tosi, jos annettu teksti on tyhjä.";
diff --git a/msg/js/fr.js b/msg/js/fr.js
index 0b6ee1395..6ca583009 100644
--- a/msg/js/fr.js
+++ b/msg/js/fr.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Crée une copie de la partie spécifié
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "trouver la première occurrence de l’élément";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "trouver la dernière occurrence de l’élément";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Renvoie l’index de la première/dernière occurrence de l’élément dans la liste. Renvoie 0 si l'élément n'est pas trouvé.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Renvoie l’index de la première/dernière occurrence de l’élément dans la liste. Renvoie %1 si l'élément n'est pas trouvé.";
 Blockly.Msg.LISTS_INLIST = "dans la liste";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 est vide";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "dans le texte";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "trouver la première occurrence de la chaîne";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "trouver la dernière occurrence de la chaîne";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Renvoie l’index de la première/dernière occurrence de la première chaîne dans la seconde. Renvoie 0 si la chaîne n’est pas trouvée.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Renvoie l’index de la première/dernière occurrence de la première chaîne dans la seconde. Renvoie %1 si la chaîne n’est pas trouvée.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 est vide";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Renvoie vrai si le texte fourni est vide.";
diff --git a/msg/js/he.js b/msg/js/he.js
index f9821d03b..d77af1d25 100644
--- a/msg/js/he.js
+++ b/msg/js/he.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "יוצרת עותק של חלק מסו
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "מחזירה את המיקום הראשון של פריט ברשימה";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "מחזירה את המיקום האחרון של פריט ברשימה";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "מחזירה את האינדקס של המופע ראשון/אחרון של הפריט ברשימה.  מחזירה 0 אם הפריט אינו נמצא.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "מחזירה את האינדקס של המופע ראשון/אחרון של הפריט ברשימה.  מחזירה %1 אם הפריט אינו נמצא.";
 Blockly.Msg.LISTS_INLIST = "ברשימה";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 הוא ריק";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "in text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "find first occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "find last occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 is empty";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";  // untranslated
diff --git a/msg/js/hi.js b/msg/js/hi.js
index 75381b197..22eca2cfa 100644
--- a/msg/js/hi.js
+++ b/msg/js/hi.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "सूची के बताए गय
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "आइटम पहली बार जहाँ आया है उसे ढूढ़े";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "आइटम आखरी बार जहाँ आया है उसे ढूढ़े";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.";  // untranslated
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.";  // untranslated
 Blockly.Msg.LISTS_INLIST = "सूची में";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 खाली है";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "इस टेक्स्ट मे";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "टेक्स्ट पहली बार जहाँ आया है उसे ढूढ़े";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "टेक्स्ट आखरी बार जहाँ आया है उसे ढूढ़े";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 खाली है";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "ट्रू रिटर्न करता है यदि दिया गया टेक्स्ट खाली है।";
diff --git a/msg/js/hrx.js b/msg/js/hrx.js
index 7f2d7e3f2..4de884b76 100644
--- a/msg/js/hrx.js
+++ b/msg/js/hrx.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Generiert en Kopie von en definierte Te
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "Such earstes Voarkommniss";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "Such letztes Voarkommniss";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Sucht die Position (index) von en Element in der List Gebt 0 zurück wenn nixs gefunn woard.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Sucht die Position (index) von en Element in der List Gebt %1 zurück wenn nixs gefunn woard.";
 Blockly.Msg.LISTS_INLIST = "in der List";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 ist leear?";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "im Text";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "Such der Begriff sein earstes Voarkommniss";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "Suche der Begriff sein letztes Vorkommniss.";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Findt das earste / letzte Voarkommniss von en Suchbegriffes in enem Text.  Gebt die Position von dem Begriff orrer 0 zurück.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Findt das earste / letzte Voarkommniss von en Suchbegriffes in enem Text.  Gebt die Position von dem Begriff orrer %1 zurück.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 ist leer?";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Ist woahr (true), wenn der Text leer ist.";
diff --git a/msg/js/hu.js b/msg/js/hu.js
index 2cc8d039e..19a74e7ec 100644
--- a/msg/js/hu.js
+++ b/msg/js/hu.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "A lista adott részéről másolat.";
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "listában első előfordulásaː";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "listában utolsó előfordulásaː";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "A megadott elem első vagy utolsó előfordulásával tér vissza. 0-val tér vissza, ha nem talál ilyen elemet.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "A megadott elem első vagy utolsó előfordulásával tér vissza. %1-val tér vissza, ha nem talál ilyen elemet.";
 Blockly.Msg.LISTS_INLIST = "A(z)";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 üres lista?";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "A(z)";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "szövegben az első előfordulásának helye";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "szövegben az utolsó előfordulásának helye";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "szövegnek";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "A keresett szöveg első vagy utolsó előfordulásával tér vissza.  0 esetén a szövegrészlet nem található.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "A keresett szöveg első vagy utolsó előfordulásával tér vissza.  %1 esetén a szövegrészlet nem található.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 üres";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Igaz, ha a vizsgált szöveg hossza 0.";
diff --git a/msg/js/ia.js b/msg/js/ia.js
index 747ec7a7a..8a071810f 100644
--- a/msg/js/ia.js
+++ b/msg/js/ia.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Crea un copia del parte specificate de
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "cercar le prime occurrentia del elemento";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "cercar le ultime occurrentia del elemento";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Retorna le indice del prime/ultime occurrentia del elemento in le lista. Retorna 0 si le texto non es trovate.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Retorna le indice del prime/ultime occurrentia del elemento in le lista. Retorna %1 si le texto non es trovate.";
 Blockly.Msg.LISTS_INLIST = "in lista";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 es vacue";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "in le texto";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "cercar le prime occurrentia del texto";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "cercar le ultime occurrentia del texto";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Retorna le indice del prime/ultime occurrentia del prime texto in le secunde texto. Retorna 0 si le texto non es trovate.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Retorna le indice del prime/ultime occurrentia del prime texto in le secunde texto. Retorna %1 si le texto non es trovate.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 es vacue";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Retorna ver si le texto fornite es vacue.";
diff --git a/msg/js/id.js b/msg/js/id.js
index 740902f0a..bbce6f70f 100644
--- a/msg/js/id.js
+++ b/msg/js/id.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Buat salinan bagian tertentu dari list.
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "cari kejadian pertama item";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "cari kejadian terakhir item";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Kembalikan indeks dari item pertama/terakhir kali muncul dalam list. Kembalikan 0 jika item tidak ditemukan.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Kembalikan indeks dari item pertama/terakhir kali muncul dalam list. Kembalikan %1 jika item tidak ditemukan.";
 Blockly.Msg.LISTS_INLIST = "dalam list";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 kosong";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "dalam teks";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "temukan kejadian pertama dalam teks";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "temukan kejadian terakhir dalam teks";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Kembalikan indeks pertama dan terakhir dari kejadian pertama/terakhir dari teks pertama dalam teks kedua.  Kembalikan 0 jika teks tidak ditemukan.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Kembalikan indeks pertama dan terakhir dari kejadian pertama/terakhir dari teks pertama dalam teks kedua.  Kembalikan %1 jika teks tidak ditemukan.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 kosong";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Kembalikan benar jika teks yang disediakan kosong.";
diff --git a/msg/js/is.js b/msg/js/is.js
index 49694b352..587c3314a 100644
--- a/msg/js/is.js
+++ b/msg/js/is.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Býr til afrit af tilteknum hluta lista
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "finna fyrsta tilfelli atriðis";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";
 Blockly.Msg.LISTS_INDEX_OF_LAST = "finna síðasta tilfelli atriðis";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Finnur hvar atriðið kemur fyrir fyrst/síðast í listanum og skilar sæti þess. Skilar 0 ef atriðið finnst ekki.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Finnur hvar atriðið kemur fyrir fyrst/síðast í listanum og skilar sæti þess. Skilar %1 ef atriðið finnst ekki.";
 Blockly.Msg.LISTS_INLIST = "í lista";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 er tómur";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "í texta";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "finna fyrsta tilfelli texta";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "finna síðasta tilfelli texta";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Finnur fyrsta/síðasta tilfelli fyrri textans í seinni textanum og skilar sæti hans. Skilar 0 ef textinn finnst ekki.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Finnur fyrsta/síðasta tilfelli fyrri textans í seinni textanum og skilar sæti hans. Skilar %1 ef textinn finnst ekki.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 er tómur";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Skilar sönnu ef gefni textinn er tómur.";
diff --git a/msg/js/it.js b/msg/js/it.js
index 7f5f8bbf7..7cac28230 100644
--- a/msg/js/it.js
+++ b/msg/js/it.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Crea una copia della porzione specifica
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "trova la prima occorrenza dell'elemento";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "trova l'ultima occorrenza dell'elemento";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Restituisce l'indice della prima/ultima occorrenza dell'elemento nella lista. Restituisce 0 se l'elemento non viene trovato.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Restituisce l'indice della prima/ultima occorrenza dell'elemento nella lista. Restituisce %1 se l'elemento non viene trovato.";
 Blockly.Msg.LISTS_INLIST = "nella lista";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 è vuota";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "nel testo";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "trova la prima occorrenza del testo";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "trova l'ultima occorrenza del testo";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Restituisce l'indice della prima occorrenza del primo testo all'interno del secondo testo. Restituisce 0 se il testo non viene trovato.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Restituisce l'indice della prima occorrenza del primo testo all'interno del secondo testo. Restituisce %1 se il testo non viene trovato.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 è vuoto";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Restituisce vero se il testo fornito è vuoto.";
diff --git a/msg/js/ja.js b/msg/js/ja.js
index b50ef7f91..49b4da209 100644
--- a/msg/js/ja.js
+++ b/msg/js/ja.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "リストの指定された部分のコ
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "最初に見つかった項目を検索します。";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "最後に見つかったアイテムを見つける";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "リスト項目の最初/最後に出現するインデックス位置を返します。項目が見つからない場合は 0 を返します。";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "リスト項目の最初/最後に出現するインデックス位置を返します。項目が見つからない場合は %1 を返します。";
 Blockly.Msg.LISTS_INLIST = "リストで";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 が空";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "テキストで";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "テキストの最初の出現箇所を検索します。";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "テキストの最後に見つかったを検索します。";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "最初のテキストの二番目のてきすとの、最初と最後の、出現したインデックスをかえします。テキストが見つからない場合は 0 を返します。";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "最初のテキストの二番目のてきすとの、最初と最後の、出現したインデックスをかえします。テキストが見つからない場合は %1 を返します。";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 が空";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "指定されたテキストが空の場合は、true を返します。";
diff --git a/msg/js/ko.js b/msg/js/ko.js
index f1f066be4..ab1fdb61d 100644
--- a/msg/js/ko.js
+++ b/msg/js/ko.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "목록의 특정 부분에 대한 복
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "처음으로 나타난 위치";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";
 Blockly.Msg.LISTS_INDEX_OF_LAST = "마지막으로 나타난 위치";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "아이템이 나타난 처음 또는 마지막 위치를 찾아 돌려줍니다. 아이템이 없으면 0이 반환됩니다.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "아이템이 나타난 처음 또는 마지막 위치를 찾아 돌려줍니다. 아이템이 없으면 %1이 반환됩니다.";
 Blockly.Msg.LISTS_INLIST = "리스트";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1이 비어 있습니다";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "문장";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "에서 다음 문장이 처음으로 나타난 위치 찾기 :";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "에서 다음 문장이 마지막으로 나타난 위치 찾기 :";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "어떤 문장이 가장 처음 나타난 위치 또는, 가장 마지막으로 나타난 위치를 찾아 돌려줍니다. 찾는 문장이 없는 경우는 0 값을 돌려줌.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "어떤 문장이 가장 처음 나타난 위치 또는, 가장 마지막으로 나타난 위치를 찾아 돌려줍니다. 찾는 문장이 없는 경우는 %1 값을 돌려줌.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1이 비어 있습니다";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "입력된 문장이, 빈 문장(\"\")이면 참(true) 값을 돌려줍니다.";
diff --git a/msg/js/lb.js b/msg/js/lb.js
index 7f887c694..6b4f2bf73 100644
--- a/msg/js/lb.js
+++ b/msg/js/lb.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creates a copy of the specified portion
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "find first occurrence of item";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "find last occurrence of item";  // untranslated
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.";  // untranslated
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.";  // untranslated
 Blockly.Msg.LISTS_INLIST = "an der Lëscht";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 ass eidel";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "am Text";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "find first occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "find last occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 ass eidel";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";  // untranslated
diff --git a/msg/js/lki.js b/msg/js/lki.js
index 9a5c227a3..194a79b1b 100644
--- a/msg/js/lki.js
+++ b/msg/js/lki.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "کپی از قسمت مشخص‌شده
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "یافتن اولین رخ‌داد مورد";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "یافتن آخرین رخ‌داد مورد";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. ۰ بر می‌گرداند اگر آیتم موجود نبود.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. %1 بر می‌گرداند اگر آیتم موجود نبود.";
 Blockly.Msg.LISTS_INLIST = "در فهرست";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 خالی است";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "در متن";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "اولین رخداد متن را بیاب";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "آخرین رخداد متن را بیاب";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد ۰ باز می‌گرداند.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد %1 باز می‌گرداند.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 خالی است";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "اضافه‌کردن صحیح اگر متن فراهم‌شده خالی است.";
diff --git a/msg/js/lrc.js b/msg/js/lrc.js
index dcb7238d2..3ee399438 100644
--- a/msg/js/lrc.js
+++ b/msg/js/lrc.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creates a copy of the specified portion
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "find first occurrence of item";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "find last occurrence of item";  // untranslated
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.";  // untranslated
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.";  // untranslated
 Blockly.Msg.LISTS_INLIST = "د نوم گه";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 حالیه";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "د متن";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "find first occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "find last occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 حالیه";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";  // untranslated
diff --git a/msg/js/lt.js b/msg/js/lt.js
index 60ed8d781..c30d28daa 100644
--- a/msg/js/lt.js
+++ b/msg/js/lt.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creates a copy of the specified portion
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "rask pirmą reikšmę";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "rask paskutinę reikšmę";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Grąžina pirmos/paskutinės reikšmės eilės nr. sąraše. Grąžina 0, jei reikšmės neranda.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Grąžina pirmos/paskutinės reikšmės eilės nr. sąraše. Grąžina %1, jei reikšmės neranda.";
 Blockly.Msg.LISTS_INLIST = "sąraše";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 yra tuščias";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "tekste";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "rask,kur pirmą kartą paminėta";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "rask,kur paskutinį kartą paminėta";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 yra tuščias";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";  // untranslated
diff --git a/msg/js/mk.js b/msg/js/mk.js
index 370483a21..3dc2d4e92 100644
--- a/msg/js/mk.js
+++ b/msg/js/mk.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creates a copy of the specified portion
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "find first occurrence of item";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "find last occurrence of item";  // untranslated
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.";  // untranslated
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.";  // untranslated
 Blockly.Msg.LISTS_INLIST = "in list";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 is empty";  // untranslated
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "in text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "find first occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "find last occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 is empty";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";  // untranslated
diff --git a/msg/js/ms.js b/msg/js/ms.js
index 2b4f0a0fd..3b6023f5a 100644
--- a/msg/js/ms.js
+++ b/msg/js/ms.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Wujudkan salinan bahagian yang ditentuk
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "cari pertama item kejadian";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "cari kejadian akhir item";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Menyatakan indeks kejadian pertama/terakhir item berkenaan dalam senarai. Menyatakan 0 jika item berkenaan tidak ditemui.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Menyatakan indeks kejadian pertama/terakhir item berkenaan dalam senarai. Menyatakan %1 jika item berkenaan tidak ditemui.";
 Blockly.Msg.LISTS_INLIST = "dalam senarai";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 adalah kosong";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "dalam teks";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "mencari kejadian pertama teks";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "mencari kejadian terakhir teks";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Kembalikan Indeks kejadian pertama/terakhir dari teks pertama ke dalam teks kedua.  Kembalikan 0 Jika teks tidak ditemui.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Kembalikan Indeks kejadian pertama/terakhir dari teks pertama ke dalam teks kedua.  Kembalikan %1 Jika teks tidak ditemui.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 adalah kosong";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Kembalikan benar jika teks yang disediakan adalah kosong.";
diff --git a/msg/js/nb.js b/msg/js/nb.js
index f240cba10..e37163936 100644
--- a/msg/js/nb.js
+++ b/msg/js/nb.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Kopiérer en ønsket del av en liste.";
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "finn første forekomst av elementet";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "finn siste forekomst av elementet";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returnerer indeksen av den første/siste forekomsten av elementet i lista. Returnerer 0 hvis ikke funnet.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returnerer indeksen av den første/siste forekomsten av elementet i lista. Returnerer %1 hvis ikke funnet.";
 Blockly.Msg.LISTS_INLIST = "i listen";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 er tom";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "i tekst";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "finn første forekomst av tekst";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "finn siste forekomst av tekst";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returnerer posisjonen for første/siste forekomsten av den første tekst i den andre teksten.  Returnerer 0 hvis teksten ikke blir funnet.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returnerer posisjonen for første/siste forekomsten av den første tekst i den andre teksten.  Returnerer %1 hvis teksten ikke blir funnet.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 er tom";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returnerer sann hvis den angitte teksten er tom.";
diff --git a/msg/js/nl.js b/msg/js/nl.js
index dc3e79145..bb8e42e2f 100644
--- a/msg/js/nl.js
+++ b/msg/js/nl.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Maakt een kopie van het opgegeven deel
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "zoek eerste voorkomen van item";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";
 Blockly.Msg.LISTS_INDEX_OF_LAST = "zoek laatste voorkomen van item";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Geeft de index terug van het eerste of laatste voorkomen van een item in de lijst. Geeft 0 terug als het item niet is gevonden.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Geeft de index terug van het eerste of laatste voorkomen van een item in de lijst. Geeft %1 terug als het item niet is gevonden.";
 Blockly.Msg.LISTS_INLIST = "in lijst";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 is leeg";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "in tekst";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "zoek eerste voorkomen van tekst";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "zoek het laatste voorkomen van tekst";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Geeft de index terug van de eerste/laatste aanwezigheid van de eerste tekst in de tweede tekst. Geeft 0 terug als de tekst niet gevonden is.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Geeft de index terug van de eerste/laatste aanwezigheid van de eerste tekst in de tweede tekst. Geeft %1 terug als de tekst niet gevonden is.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 is leeg";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Geeft \"waar\" terug, als de opgegeven tekst leeg is.";
diff --git a/msg/js/oc.js b/msg/js/oc.js
index f6552b502..2ac9ab82c 100644
--- a/msg/js/oc.js
+++ b/msg/js/oc.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creates a copy of the specified portion
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "find first occurrence of item";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "find last occurrence of item";  // untranslated
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.";  // untranslated
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.";  // untranslated
 Blockly.Msg.LISTS_INLIST = "dins la lista";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 is empty";  // untranslated
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "dins lo tèxte";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "find first occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "find last occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 es void";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";  // untranslated
diff --git a/msg/js/pl.js b/msg/js/pl.js
index 86b18555e..aac6292e4 100644
--- a/msg/js/pl.js
+++ b/msg/js/pl.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Tworzy kopię z określoną część li
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "znaleźć pierwsze wystąpienie elementu";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "znajduje ostatanie wystąpienie elementu";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Zwraca indeks pierwszego/ostatniego wystąpienia elementu na liście. Zwraca wartość 0, jeśli tekst nie zostanie znaleziony.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Zwraca indeks pierwszego/ostatniego wystąpienia elementu na liście. Zwraca wartość %1, jeśli tekst nie zostanie znaleziony.";
 Blockly.Msg.LISTS_INLIST = "na liście";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 jest pusty";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "w tekście";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "znajdź pierwsze wystąpienie tekstu";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "znajdź ostatnie wystąpienie tekstu";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Zwraca indeks pierwszego/ostatniego wystąpienia pierwszego tekstu w drugim tekście. Zwraca wartość 0, jeśli tekst nie został znaleziony.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Zwraca indeks pierwszego/ostatniego wystąpienia pierwszego tekstu w drugim tekście. Zwraca wartość %1, jeśli tekst nie został znaleziony.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 jest pusty";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Zwraca prawda (true), jeśli podany tekst jest pusty.";
diff --git a/msg/js/pms.js b/msg/js/pms.js
index d62a65244..50a4917b5 100644
--- a/msg/js/pms.js
+++ b/msg/js/pms.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "A crea na còpia dël tòch ëspessific
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "trové la prima ocorensa dl'element";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "trové l'ùltima ocorensa dl'element";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "A smon l'ìndes ëd la prima/ùltima ocorensa dl'element ant la lista. A smon 0 se l'element a l'é nen trovà.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "A smon l'ìndes ëd la prima/ùltima ocorensa dl'element ant la lista. A smon %1 se l'element a l'é nen trovà.";
 Blockly.Msg.LISTS_INLIST = "ant la lista";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 a l'é veuid";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "ant ël test";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "trové la prima ocorensa dël test";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "trové l'ùltima ocorensa dël test";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "A smon l'ìndes dla prima/ùltima ocorensa dël prim test ant ël second test. A smon 0 se ël test a l'é nen trovà.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "A smon l'ìndes dla prima/ùltima ocorensa dël prim test ant ël second test. A smon %1 se ël test a l'é nen trovà.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 a l'é veuid";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "A smon ver se ël test fornì a l'é veuid.";
diff --git a/msg/js/pt-br.js b/msg/js/pt-br.js
index 8dbc3571f..2598b499a 100644
--- a/msg/js/pt-br.js
+++ b/msg/js/pt-br.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Cria uma cópia da porção especificad
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "encontre a primeira ocorrência do item";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "encontre a última ocorrência do item";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Retorna o índice da primeira/última ocorrência do item na lista.  Retorna 0 se o item não for encontrado.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Retorna o índice da primeira/última ocorrência do item na lista.  Retorna %1 se o item não for encontrado.";
 Blockly.Msg.LISTS_INLIST = "na lista";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 é vazia";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "no texto";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "encontre a primeira ocorrência do item";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "encontre a última ocorrência do texto";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Retorna a posição da primeira/última ocorrência do primeiro texto no segundo texto.  Retorna 0 se o texto não for encontrado.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Retorna a posição da primeira/última ocorrência do primeiro texto no segundo texto.  Retorna %1 se o texto não for encontrado.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 é vazio";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Retorna verdadeiro se o texto fornecido for vazio.";
diff --git a/msg/js/pt.js b/msg/js/pt.js
index 0d8f80636..68ac03e4a 100644
--- a/msg/js/pt.js
+++ b/msg/js/pt.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Cria uma cópia da porção especificad
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "encontre a primeira ocorrência do item";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "encontre a última ocorrência do item";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Retorna a posição da primeira/última ocorrência do item na lista.  Retorna 0 se o item não for encontrado.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Retorna a posição da primeira/última ocorrência do item na lista.  Retorna %1 se o item não for encontrado.";
 Blockly.Msg.LISTS_INLIST = "na lista";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 está vazia";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "no texto";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "primeira ocorrência do texto";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "última ocorrência do texto";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Retorna a posição da primeira/última ocorrência do primeiro texto no segundo texto.  Retorna 0 se o texto não for encontrado.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Retorna a posição da primeira/última ocorrência do primeiro texto no segundo texto.  Retorna %1 se o texto não for encontrado.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 está vazio";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Retorna verdadeiro se o texto fornecido estiver vazio.";
diff --git a/msg/js/ro.js b/msg/js/ro.js
index c9f5f6073..a314af4da 100644
--- a/msg/js/ro.js
+++ b/msg/js/ro.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creează o copie a porţiunii specifica
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "Găseşte prima apariţie a elementului";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "găseşte ultima apariţie a elementului";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Revine la indexul de la prima/ultima apariție a elementului din listă. Returnează 0 dacă elementul nu este găsit.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Revine la indexul de la prima/ultima apariție a elementului din listă. Returnează %1 dacă elementul nu este găsit.";
 Blockly.Msg.LISTS_INLIST = "în listă";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 este gol";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "în text";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "găseşte prima apariţie a textului";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "găseşte ultima apariţie a textului";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returnează indicele primei/ultimei apariţii din primul text în al doilea text.  Returnează 0 dacă textul nu este găsit.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returnează indicele primei/ultimei apariţii din primul text în al doilea text.  Returnează %1 dacă textul nu este găsit.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 este gol";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returnează adevărat dacă textul furnizat este gol.";
diff --git a/msg/js/ru.js b/msg/js/ru.js
index f419884de..713a90d00 100644
--- a/msg/js/ru.js
+++ b/msg/js/ru.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Создаёт копию указан
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "найти первое вхождение элемента";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "найти последнее вхождение элемента";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Возвращает номер позиции первого/последнего вхождения элемента в списке. Возвращает 0, если элемент не найден.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Возвращает номер позиции первого/последнего вхождения элемента в списке. Возвращает %1, если элемент не найден.";
 Blockly.Msg.LISTS_INLIST = "в списке";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 пуст";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "в тексте";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "найти первое вхождение текста";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "найти последнее вхождение текста";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Возвращает номер позиции первого/последнего вхождения первого текста во  втором.  Возвращает 0, если текст не найден.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Возвращает номер позиции первого/последнего вхождения первого текста во  втором.  Возвращает %1, если текст не найден.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 пуст";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Возвращает значение истина, если предоставленный текст пуст.";
diff --git a/msg/js/sc.js b/msg/js/sc.js
index b15435db9..b592a736d 100644
--- a/msg/js/sc.js
+++ b/msg/js/sc.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Fait una copia de sa parti inditada de
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "circa prima ocasioni de s'item";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "circa urtima ocasioni de s'item";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Torrat s'indixi de sa primu/urtima ocasioni de s'item in sa lista. Torrat 0 si s'item non s'agatat.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Torrat s'indixi de sa primu/urtima ocasioni de s'item in sa lista. Torrat %1 si s'item non s'agatat.";
 Blockly.Msg.LISTS_INLIST = "in lista";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 est buidu";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "in su testu";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "circa prima ocasioni de su testu";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "circa urtima ocasioni de su testu";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Torrat s'indixi de sa primu/urtima ocasioni de su primu testu in su segundu testu. Torrat 0 si su testu no ddu agatat.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Torrat s'indixi de sa primu/urtima ocasioni de su primu testu in su segundu testu. Torrat %1 si su testu no ddu agatat.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 est buidu";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Torrat berus si su testu giau est buidu.";
diff --git a/msg/js/sd.js b/msg/js/sd.js
index 03f1a1f69..14a00eac6 100644
--- a/msg/js/sd.js
+++ b/msg/js/sd.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creates a copy of the specified portion
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "find first occurrence of item";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "find last occurrence of item";  // untranslated
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.";  // untranslated
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.";  // untranslated
 Blockly.Msg.LISTS_INLIST = "فهرست ۾";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 is empty";  // untranslated
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "in text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "find first occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "find last occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 is empty";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";  // untranslated
diff --git a/msg/js/shn.js b/msg/js/shn.js
index edcef357e..1032730a2 100644
--- a/msg/js/shn.js
+++ b/msg/js/shn.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creates a copy of the specified portion
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "find first occurrence of item";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "find last occurrence of item";  // untranslated
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.";  // untranslated
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.";  // untranslated
 Blockly.Msg.LISTS_INLIST = "in list";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 is empty";  // untranslated
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "in text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "find first occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "find last occurrence of text";  // untranslated
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 is empty";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";  // untranslated
diff --git a/msg/js/sk.js b/msg/js/sk.js
index ac547f541..cf96de036 100644
--- a/msg/js/sk.js
+++ b/msg/js/sk.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Skopíruje určený úsek zoznamu.";
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "nájdi prvý výskyt prvku";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "nájdi posledný výskyt prvku";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Vráti index prvého/posledného výskytu prvku v zozname. Ak sa nič nenašlo, vráti 0.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Vráti index prvého/posledného výskytu prvku v zozname. Ak sa nič nenašlo, vráti %1.";
 Blockly.Msg.LISTS_INLIST = "v zozname";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 je prázdny";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "v texte";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "nájdi prvý výskyt textu";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "nájdi posledný výskyt textu";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Vráti index prvého/posledného výskytu prvého textu v druhom texte. Ak nenájde, vráti 0.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Vráti index prvého/posledného výskytu prvého textu v druhom texte. Ak nenájde, vráti %1.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 je prázdny";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Vráti hodnotu pravda, ak zadaný text je prázdny.";
diff --git a/msg/js/sl.js b/msg/js/sl.js
index 10f9a6bf4..c56db20a4 100644
--- a/msg/js/sl.js
+++ b/msg/js/sl.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Ustvari nov seznam, kot kopijo določen
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "najdi prvo pojavitev elementa";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";
 Blockly.Msg.LISTS_INDEX_OF_LAST = "najdi zadnjo pojavitev elementa";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Vrne mesto (indeks) prve/zadnje pojavitve elementa v seznamu. Če elementa ne najde, vrne 0.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Vrne mesto (indeks) prve/zadnje pojavitve elementa v seznamu. Če elementa ne najde, vrne %1.";
 Blockly.Msg.LISTS_INLIST = "v seznamu";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 je prazen";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "v besedilu";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "najdi prvo pojavitev besedila";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "najdi zadnjo pojavitev besedila";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Vrne mesto (indeks) prve/zadnje pojavitve drugega besedila v prvem besedilu. Če besedila ne najde, vrne 0.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Vrne mesto (indeks) prve/zadnje pojavitve drugega besedila v prvem besedilu. Če besedila ne najde, vrne %1.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 je prazno";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Vrne resnično, če je določeno besedilo prazno.";
diff --git a/msg/js/sq.js b/msg/js/sq.js
index e90eab5f2..0f85eb8c1 100644
--- a/msg/js/sq.js
+++ b/msg/js/sq.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Krijon në kopje të pjesës së specif
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "gjen ndodhjen e parë të sendit";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "gjen ndodhjen e fundit të sendit";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Kthen indeksin e ndodhjes së parë/fudit të sendit në listë. Kthen 0 nëse teksti nuk është gjetur.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Kthen indeksin e ndodhjes së parë/fudit të sendit në listë. Kthen %1 nëse teksti nuk është gjetur.";
 Blockly.Msg.LISTS_INLIST = "në listë";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 është e zbraztë";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "ne tekst";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "gjej rastisjen e pare te tekstit";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "gjej rastisjen e fundit te tekstit";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Pergjigjet me indeksin e pare/fundit te rastisjes se tekstit te pare ne tekstin e dyte. Pergjigjet me 0 ne qofte se teksti nuk u gjet.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Pergjigjet me indeksin e pare/fundit te rastisjes se tekstit te pare ne tekstin e dyte. Pergjigjet me %1 ne qofte se teksti nuk u gjet.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 eshte bosh";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Kthehet e vertete neqoftese teksti i dhene eshte bosh.";
diff --git a/msg/js/sr.js b/msg/js/sr.js
index f3d56ead5..9620b1b3c 100644
--- a/msg/js/sr.js
+++ b/msg/js/sr.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Прави копију одређен
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "пронађи прво појављивање ставке";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "пронађи последње појављивање ставке";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Враћа број првог и/последњег уласка елемента у листу. Враћа 0 Ако елемент није пронађен.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Враћа број првог и/последњег уласка елемента у листу. Враћа %1 Ако елемент није пронађен.";
 Blockly.Msg.LISTS_INLIST = "на списку";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 је празан";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "у тексту";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "пронађи прво појављивање текста";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "пронађи последње појављивање текста";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Враћа однос првог/заднјег појавлјиванја текста у другом тексту. Врађа 0 ако текст није пронађен.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Враћа однос првог/заднјег појавлјиванја текста у другом тексту. Врађа %1 ако текст није пронађен.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 је празан";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Враћа тачно ако је доставлјени текст празан.";
diff --git a/msg/js/sv.js b/msg/js/sv.js
index d1ef48f40..4fccc4fdd 100644
--- a/msg/js/sv.js
+++ b/msg/js/sv.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Skapar en kopia av den specificerade de
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "hitta första förekomsten av objektet";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "hitta sista förekomsten av objektet";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Ger tillbaka den första/sista förekomsten av objektet i listan. Ger tillbaka 0 om objektet inte hittas.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Ger tillbaka den första/sista förekomsten av objektet i listan. Ger tillbaka %1 om objektet inte hittas.";
 Blockly.Msg.LISTS_INLIST = "i listan";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 är tom";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "i texten";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "hitta första förekomsten av texten";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "hitta sista förekomsten av texten";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Ger tillbaka indexet för den första/sista förekomsten av första texten i den andra texten.  Ger tillbaka 0 om texten inte hittas.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Ger tillbaka indexet för den första/sista förekomsten av första texten i den andra texten.  Ger tillbaka %1 om texten inte hittas.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 är tom";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returnerar sant om den angivna texten är tom.";
diff --git a/msg/js/ta.js b/msg/js/ta.js
index b77aeefec..4e5dca0c3 100644
--- a/msg/js/ta.js
+++ b/msg/js/ta.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "குறிப்பட்ட பக
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "உரையில் முதல் தோற்ற இடத்தை காட்டு";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "உரையில் கடைசி தோற்ற இடத்தை காட்டு";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "பட்டியலில் மதிப்பின் முதல், கடைசி தோற்ற இடத்தை பின்கொடு. காணாவிட்டால் 0 பின்கொடு.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "பட்டியலில் மதிப்பின் முதல், கடைசி தோற்ற இடத்தை பின்கொடு. காணாவிட்டால் %1 பின்கொடு.";
 Blockly.Msg.LISTS_INLIST = "பட்டியலில் உள்ள";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 காலியானது";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "உரையில்";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "உரையில் முதல் தோற்ற இடத்தை பின்கொடு";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "உரையில் கடைசி தோற்ற இடத்தை பின்கொடு";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "இரண்டாவது உரையில் முதல் உரையின் முதல்/கடை இருக்கை குறிஎண்ணை பின்கொடு.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 காலியானது";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "காலியானது என்றால் மெய் மதிப்பை பின்கொடு";
diff --git a/msg/js/tcy.js b/msg/js/tcy.js
index a2939bca4..9c6196805 100644
--- a/msg/js/tcy.js
+++ b/msg/js/tcy.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "ಪಟ್ಯೊದ ನಿರ್ದಿ
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "ದುಂಬು ಕರಿನ ಪಟ್ಯೊನು ನಾಡ್‍ಲೆ";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "ಅಕೆರಿಗ್ ಕರಿನ ಪಟ್ಯೊನು ನಾಡ್‍ಲೆ";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "ಸುರುತ ಪಟ್ಯೊದ ಸೂಚ್ಯಿ/ಅಕೇರಿಟ್ ಸಂಭವಿಸವುನ ಸುರುತ ಪಟ್ಟಯೊದುಲಯಿದ ರಡ್ಡನೆ ಪಟ್ಯೊನು ಪಿರಕೊರು.  ೦ ಪಟ್ಯೊ ತಿಕಂದಿತ್ತ್‌ಂಡ ಪಿರಕೊರು.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "ಸುರುತ ಪಟ್ಯೊದ ಸೂಚ್ಯಿ/ಅಕೇರಿಟ್ ಸಂಭವಿಸವುನ ಸುರುತ ಪಟ್ಟಯೊದುಲಯಿದ ರಡ್ಡನೆ ಪಟ್ಯೊನು ಪಿರಕೊರು.  %1 ಪಟ್ಯೊ ತಿಕಂದಿತ್ತ್‌ಂಡ ಪಿರಕೊರು.";
 Blockly.Msg.LISTS_INLIST = "ಪಟ್ಟಿಡ್";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 ಕಾಲಿ";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "ಪಟ್ಯೊಡು";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "ಸುರುಟು ಸಂಭವಿಸಯಿನ ಪಟ್ಯೊನು ನಾಡ್‍ಲ";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "ದುಂಬು ಕರಿನ ಪಟ್ಯೊನು ನಾಡ್‍ಲೆ";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "ಸುರುತ ಪಟ್ಯೊದ ಸೂಚ್ಯಿ/ಅಕೇರಿಟ್ ಸಂಭವಿಸವುನ ಸುರುತ ಪಟ್ಟಯೊದುಲಯಿದ ರಡ್ಡನೆ ಪಟ್ಯೊನು ಪಿರಕೊರು.  ೦ ಪಟ್ಯೊ ತಿಕಂದಿತ್ತ್‌ಂಡ ಪಿರಕೊರು.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "ಸುರುತ ಪಟ್ಯೊದ ಸೂಚ್ಯಿ/ಅಕೇರಿಟ್ ಸಂಭವಿಸವುನ ಸುರುತ ಪಟ್ಟಯೊದುಲಯಿದ ರಡ್ಡನೆ ಪಟ್ಯೊನು ಪಿರಕೊರು.  %1 ಪಟ್ಯೊ ತಿಕಂದಿತ್ತ್‌ಂಡ ಪಿರಕೊರು.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 ಕಾಲಿ";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "ಕೊರ್‌ನ ಪಟ್ಯೊ ಕಾಲಿಂದ್ ಸತ್ಯೊ ಆಂಡ ಪಿರಕೊರು";
diff --git a/msg/js/th.js b/msg/js/th.js
index 0b8ebf6d0..fbb56360e 100644
--- a/msg/js/th.js
+++ b/msg/js/th.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "สร้างสำเนาราย
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "หาอันแรกที่พบ";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "หาอันสุดท้ายที่พบ";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "คืนค่าตำแหน่งของไอเท็มอันแรก/สุดท้ายที่พบในรายการ คืนค่า 0 ถ้าหาไม่พบ";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "คืนค่าตำแหน่งของไอเท็มอันแรก/สุดท้ายที่พบในรายการ คืนค่า %1 ถ้าหาไม่พบ";
 Blockly.Msg.LISTS_INLIST = "ในรายการ";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 ว่างเปล่า";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "ในข้อความ";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "หาข้อความแรกที่พบ";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "หาข้อความสุดท้ายที่พบ";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "คืนค่าตำแหน่งที่พบข้อความแรกอยู่ในข้อความที่สอง คืนค่า 0 ถ้าหาไม่พบ";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "คืนค่าตำแหน่งที่พบข้อความแรกอยู่ในข้อความที่สอง คืนค่า %1 ถ้าหาไม่พบ";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 ว่าง";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "คืนค่าจริง ถ้าข้อความยังว่าง";
diff --git a/msg/js/tl.js b/msg/js/tl.js
index b8a3bb01d..6eebfa10f 100644
--- a/msg/js/tl.js
+++ b/msg/js/tl.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Gumagawa ng kopya ng tinukoy na bahagi
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "Hanapin ang unang pangyayari ng item";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "hanapin ang huling pangyayari ng item";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Pagbalik ng index ng una/huli pangyayari ng item sa list. Pagbalik ng 0 kung ang item ay hindi makita.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Pagbalik ng index ng una/huli pangyayari ng item sa list. Pagbalik ng %1 kung ang item ay hindi makita.";
 Blockly.Msg.LISTS_INLIST = "sa list";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 ay walang laman";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "in text";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "find first occurrence of text";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "find last occurrence of text";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of first text in the second text.  Returns 0 if text is not found.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of first text in the second text.  Returns %1 if text is not found.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 is empty";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";
diff --git a/msg/js/tlh.js b/msg/js/tlh.js
index 5c1cad0f1..e8caa5e4b 100644
--- a/msg/js/tlh.js
+++ b/msg/js/tlh.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Creates a copy of the specified portion
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "Doch sam wa'DIch";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "Doch sam Qav";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.";  // untranslated
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.";  // untranslated
 Blockly.Msg.LISTS_INLIST = "tetlhDaq";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 chIm'a'";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "ghItlhDaq";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "ghItlh wa'DIch Sam";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "ghItlh Qav Sam";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.";  // untranslated
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 chIm'a'";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Returns true if the provided text is empty.";  // untranslated
diff --git a/msg/js/tr.js b/msg/js/tr.js
index 4b949ccd2..3127afaed 100644
--- a/msg/js/tr.js
+++ b/msg/js/tr.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Listenin belirli bir kısmının kopyas
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "Öğenin ilk varolduğu yeri bul";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "Öğenin son varolduğu yeri bul";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Listedeki öğenin ilk/son oluşumunun indeksini döndürür. Eğer öğe bulunamaz ise 0 döndürür.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Listedeki öğenin ilk/son oluşumunun indeksini döndürür. Eğer öğe bulunamaz ise %1 döndürür.";
 Blockly.Msg.LISTS_INLIST = "Listede";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 boş";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "metinde";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "Metnin ilk varolduğu yeri bul";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "Metnin son varolduğu yeri bul";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "İlk metnin ikinci metnin içindeki ilk ve son varoluşlarının indeksini döndürür.Metin bulunamadıysa 0 döndürür.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "İlk metnin ikinci metnin içindeki ilk ve son varoluşlarının indeksini döndürür.Metin bulunamadıysa %1 döndürür.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 boş";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Verilen metin boşsa true(doğru) değerini verir.";
diff --git a/msg/js/uk.js b/msg/js/uk.js
index 1e4aeb8ff..0db4abc06 100644
--- a/msg/js/uk.js
+++ b/msg/js/uk.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Створює копію вказан
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "знайти перше входження елемента";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "знайти останнє входження елемента";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Повертає індекс першого/останнього входження елемента у списку. Повертає 0, якщо елемент не знайдено.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Повертає індекс першого/останнього входження елемента у списку. Повертає %1, якщо елемент не знайдено.";
 Blockly.Msg.LISTS_INLIST = "у списку";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 є порожнім";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "у тексті";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "знайти перше входження тексту";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "знайти останнє входження тексту";
 Blockly.Msg.TEXT_INDEXOF_TAIL = ".";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Повертає індекс першого/останнього входження першого тексту в другий. Повертає 0, якщо текст не знайдено.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Повертає індекс першого/останнього входження першого тексту в другий. Повертає %1, якщо текст не знайдено.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 є порожнім";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Повертає істину, якщо вказаний текст порожній.";
diff --git a/msg/js/vi.js b/msg/js/vi.js
index f5c1ccc04..8bde3fbf8 100644
--- a/msg/js/vi.js
+++ b/msg/js/vi.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "Lấy một mảng của danh sách nà
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "tìm sự có mặt đầu tiên của vật";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "tìm sự có mặt cuối cùng của vật";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Hoàn trả vị trí xuất hiện đầu/cuối của vật trong danh sách.  Nếu không tìm thấy thì hoàn trả số 0.";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "Hoàn trả vị trí xuất hiện đầu/cuối của vật trong danh sách.  Nếu không tìm thấy thì hoàn trả số %1.";
 Blockly.Msg.LISTS_INLIST = "trong dánh sách";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 trống rỗng";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "trong văn bản";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "tìm sự có mặt đầu tiên của";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "tìm sự có mặt cuối cùng của";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Hoàn trả vị trí xuất hiện đầu/cuối của văn bản thứ nhất trong văn bản thứ hai.  Nếu không tìm thấy thì hoàn trả số 0.";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "Hoàn trả vị trí xuất hiện đầu/cuối của văn bản thứ nhất trong văn bản thứ hai.  Nếu không tìm thấy thì hoàn trả số %1.";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 trống không";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "Hoàn trả “đúng nếu văn bản không có ký tự nào.";
diff --git a/msg/js/zh-hans.js b/msg/js/zh-hans.js
index ebdb6b8d9..262e1b5c5 100644
--- a/msg/js/zh-hans.js
+++ b/msg/js/zh-hans.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "复制列表中指定的部分。";
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "找出第一个项出现";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "找出最后一个项出现";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "返回在列表中的第一/最后一个匹配项的索引值。如果找不到项目则返回0。";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "返回在列表中的第一/最后一个匹配项的索引值。如果找不到项目则返回%1。";
 Blockly.Msg.LISTS_INLIST = "在列表中";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1是空的";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "自文本";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "寻找第一个出现的文本";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "寻找最后一个出现的文本";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "空白";
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "返回在第二个字串中的第一/最后一个匹配项的索引值。如果未找到则返回 0。";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "返回在第二个字串中的第一/最后一个匹配项的索引值。如果未找到则返回 %1。";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1是空的";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "如果提供的文本为空，则返回真。";
diff --git a/msg/js/zh-hant.js b/msg/js/zh-hant.js
index 0083b6e9a..40e349e49 100644
--- a/msg/js/zh-hant.js
+++ b/msg/js/zh-hant.js
@@ -116,7 +116,7 @@ Blockly.Msg.LISTS_GET_SUBLIST_TOOLTIP = "複製列表中指定的部分。";
 Blockly.Msg.LISTS_INDEX_OF_FIRST = "找出 第一個 項目出現";
 Blockly.Msg.LISTS_INDEX_OF_HELPURL = "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list";  // untranslated
 Blockly.Msg.LISTS_INDEX_OF_LAST = "找出 最後一個 項目出現";
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "返回在列表中的第一個/最後一個匹配項目的索引值。如果未找到則返回 0。";
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = "返回在列表中的第一個/最後一個匹配項目的索引值。如果未找到則返回 %1。";
 Blockly.Msg.LISTS_INLIST = "自列表";
 Blockly.Msg.LISTS_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Lists#is-empty";  // untranslated
 Blockly.Msg.LISTS_ISEMPTY_TITLE = "%1 值為空";
@@ -334,7 +334,7 @@ Blockly.Msg.TEXT_INDEXOF_INPUT_INTEXT = "在字串";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_FIRST = "尋找 第一個 出現的字串";
 Blockly.Msg.TEXT_INDEXOF_OPERATOR_LAST = "尋找 最後一個 出現的字串";
 Blockly.Msg.TEXT_INDEXOF_TAIL = "";  // untranslated
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "返回在第二個字串中的第一個/最後一個匹配項目的索引值。如果未找到則返回 0。";
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = "返回在第二個字串中的第一個/最後一個匹配項目的索引值。如果未找到則返回 %1。";
 Blockly.Msg.TEXT_ISEMPTY_HELPURL = "https://github.com/google/blockly/wiki/Text#checking-for-empty-text";  // untranslated
 Blockly.Msg.TEXT_ISEMPTY_TITLE = "%1 為空";
 Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = "如果提供的字串為空，則返回 真。";
diff --git a/msg/json/ar.json b/msg/json/ar.json
index 9e6af93e9..e4df170aa 100644
--- a/msg/json/ar.json
+++ b/msg/json/ar.json
@@ -192,7 +192,7 @@
 	"TEXT_LENGTH_TOOLTIP": "تقوم بإرجاع عدد الاحرف (بما في ذلك الفراغات) في النص المقدم.",
 	"TEXT_ISEMPTY_TITLE": "%1 فارغ",
 	"TEXT_ISEMPTY_TOOLTIP": "يرجع \"صحيح\" إذا كان النص المقدم فارغ.",
-	"TEXT_INDEXOF_TOOLTIP": "تقوم بإرجاع مؤشر التواجد الأول/الأخير للنص الأول في النص الثاني.  تقوم بإرجاع 0 إذا لم يتم العثور على النص.",
+	"TEXT_INDEXOF_TOOLTIP": "تقوم بإرجاع مؤشر التواجد الأول/الأخير للنص الأول في النص الثاني.  تقوم بإرجاع %1 إذا لم يتم العثور على النص.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "في النص",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "ابحث عن التواجد الأول للنص",
 	"TEXT_INDEXOF_OPERATOR_LAST": "ابحث عن التواجد الأخير للنص",
@@ -242,7 +242,7 @@
 	"LISTS_INLIST": "في قائمة",
 	"LISTS_INDEX_OF_FIRST": "ابحث على على التواجد الأول للعنصر",
 	"LISTS_INDEX_OF_LAST": "ابحث على التواجد الأخير للعنصر",
-	"LISTS_INDEX_OF_TOOLTIP": "تقوم بإرجاع مؤشر التواجد  الأول/الأخير في القائمة.  تقوم بإرجاع 0 إذا لم يتم العثور على النص.",
+	"LISTS_INDEX_OF_TOOLTIP": "تقوم بإرجاع مؤشر التواجد  الأول/الأخير في القائمة.  تقوم بإرجاع %1 إذا لم يتم العثور على النص.",
 	"LISTS_GET_INDEX_GET": "احصل على",
 	"LISTS_GET_INDEX_GET_REMOVE": "احصل على و ازل",
 	"LISTS_GET_INDEX_REMOVE": "ازل",
diff --git a/msg/json/az.json b/msg/json/az.json
index ec9df30fd..d9cd24738 100644
--- a/msg/json/az.json
+++ b/msg/json/az.json
@@ -182,7 +182,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Verilmiş mətndəki hərflərin(sözlər arası boşluqlar sayılmaqla) sayını qaytarır.",
 	"TEXT_ISEMPTY_TITLE": "%1 boşdur",
 	"TEXT_ISEMPTY_TOOLTIP": "Verilmiş mətn boşdursa, doğru qiymətini qaytarır.",
-	"TEXT_INDEXOF_TOOLTIP": "Birinci mətnin ikinci mətndə ilk/son rastlaşma indeksini qaytarır. Əgər rastlaşma baş verməzsə, 0 qaytarır.",
+	"TEXT_INDEXOF_TOOLTIP": "Birinci mətnin ikinci mətndə ilk/son rastlaşma indeksini qaytarır. Əgər rastlaşma baş verməzsə, %1 qaytarır.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "mətndə",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "Bu mətn ilə ilk rastlaşmanı tap:",
 	"TEXT_INDEXOF_OPERATOR_LAST": "Bu mətn ilə son rastlaşmanı tap:",
@@ -231,7 +231,7 @@
 	"LISTS_INLIST": "siyahıda",
 	"LISTS_INDEX_OF_FIRST": "Element ilə ilk rastlaşma indeksini müəyyən edin",
 	"LISTS_INDEX_OF_LAST": "Element ilə son rastlaşma indeksini müəyyən edin",
-	"LISTS_INDEX_OF_TOOLTIP": "Siyahıda element ilə ilk/son rastlaşma indeksini qaytarır. Əgər tekst siyahıda tapılmazsa, 0 qaytarılır.",
+	"LISTS_INDEX_OF_TOOLTIP": "Siyahıda element ilə ilk/son rastlaşma indeksini qaytarır. Əgər tekst siyahıda tapılmazsa, %1 qaytarılır.",
 	"LISTS_GET_INDEX_GET": "götür",
 	"LISTS_GET_INDEX_GET_REMOVE": "götür və sil",
 	"LISTS_GET_INDEX_REMOVE": "yığışdır",
diff --git a/msg/json/bcc.json b/msg/json/bcc.json
index a3f50cfef..c8b0c3652 100644
--- a/msg/json/bcc.json
+++ b/msg/json/bcc.json
@@ -171,7 +171,7 @@
 	"TEXT_LENGTH_TOOLTIP": "بازگرداندن عددی از حروف (شامل فاصله‌ها) در متن فراهم‌شده.",
 	"TEXT_ISEMPTY_TITLE": "%1 خالی است",
 	"TEXT_ISEMPTY_TOOLTIP": "اضافه‌کردن صحیح اگر متن فراهم‌شده خالی است.",
-	"TEXT_INDEXOF_TOOLTIP": "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد ۰ باز می‌گرداند.",
+	"TEXT_INDEXOF_TOOLTIP": "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد %1 باز می‌گرداند.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "در متن",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "اولین رخداد متن را بیاب",
 	"TEXT_INDEXOF_OPERATOR_LAST": "آخرین رخداد متن را بیاب",
@@ -220,7 +220,7 @@
 	"LISTS_INLIST": "در فهرست",
 	"LISTS_INDEX_OF_FIRST": "آخرین رخداد متن را بیاب",
 	"LISTS_INDEX_OF_LAST": "یافتن آخرین رخ‌داد مورد",
-	"LISTS_INDEX_OF_TOOLTIP": "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. ۰ بر می‌گرداند اگر متن موجود نبود.",
+	"LISTS_INDEX_OF_TOOLTIP": "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. %1 بر می‌گرداند اگر متن موجود نبود.",
 	"LISTS_GET_INDEX_GET": "گرفتن",
 	"LISTS_GET_INDEX_GET_REMOVE": "گرفتن و حذف‌کردن",
 	"LISTS_GET_INDEX_REMOVE": "حذف‌کردن",
diff --git a/msg/json/be-tarask.json b/msg/json/be-tarask.json
index f7edf7507..a996325db 100644
--- a/msg/json/be-tarask.json
+++ b/msg/json/be-tarask.json
@@ -178,7 +178,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Вяртае колькасьць літараў (у тым ліку прабелы) у пададзеным тэксьце.",
 	"TEXT_ISEMPTY_TITLE": "%1 пусты",
 	"TEXT_ISEMPTY_TOOLTIP": "Вяртае значэньне ісьціна, калі тэкст пусты.",
-	"TEXT_INDEXOF_TOOLTIP": "Вяртае індэкс першага/апошняга ўваходжаньня першага тэксту ў другі тэкст. Вяртае 0, калі тэкст ня знойдзены.",
+	"TEXT_INDEXOF_TOOLTIP": "Вяртае індэкс першага/апошняга ўваходжаньня першага тэксту ў другі тэкст. Вяртае %1, калі тэкст ня знойдзены.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "у тэксьце",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "знайсьці першае ўваходжаньне тэксту",
 	"TEXT_INDEXOF_OPERATOR_LAST": "знайсьці апошняе ўваходжаньне тэксту",
@@ -227,7 +227,7 @@
 	"LISTS_INLIST": "у сьпісе",
 	"LISTS_INDEX_OF_FIRST": "знайсьці першае ўваходжаньне элемэнту",
 	"LISTS_INDEX_OF_LAST": "знайсьці апошняе ўваходжаньне элемэнту",
-	"LISTS_INDEX_OF_TOOLTIP": "Вяртае індэкс першага/апошняга ўваходжаньня элемэнту ў сьпіс. Вяртае 0, калі элемэнт ня знойдзены.",
+	"LISTS_INDEX_OF_TOOLTIP": "Вяртае індэкс першага/апошняга ўваходжаньня элемэнту ў сьпіс. Вяртае %1, калі элемэнт ня знойдзены.",
 	"LISTS_GET_INDEX_GET": "атрымаць",
 	"LISTS_GET_INDEX_GET_REMOVE": "атрымаць і выдаліць",
 	"LISTS_GET_INDEX_REMOVE": "выдаліць",
diff --git a/msg/json/bg.json b/msg/json/bg.json
index ab3eceed0..f35a6c2aa 100644
--- a/msg/json/bg.json
+++ b/msg/json/bg.json
@@ -177,7 +177,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Връща броя на символите (включително и интервалите) в текста.",
 	"TEXT_ISEMPTY_TITLE": "%1 е празен",
 	"TEXT_ISEMPTY_TOOLTIP": "Връща истина, ако текста е празен.",
-	"TEXT_INDEXOF_TOOLTIP": "Връща индекса на първото/последното срещане на първия текст във втория текст. Връща 0, ако текстът не е намерен.",
+	"TEXT_INDEXOF_TOOLTIP": "Връща индекса на първото/последното срещане на първия текст във втория текст. Връща %1, ако текстът не е намерен.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "в текста",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "намери първата поява на текста",
 	"TEXT_INDEXOF_OPERATOR_LAST": "намери последната поява на текста",
@@ -226,7 +226,7 @@
 	"LISTS_INLIST": "в списъка",
 	"LISTS_INDEX_OF_FIRST": "намери първата поява на елемента",
 	"LISTS_INDEX_OF_LAST": "намери последната поява на елемента",
-	"LISTS_INDEX_OF_TOOLTIP": "Връща индекса на първото/последното появяване на елемента в списъка. Връща 0 ако елементът не е намерен.",
+	"LISTS_INDEX_OF_TOOLTIP": "Връща индекса на първото/последното появяване на елемента в списъка. Връща %1 ако елементът не е намерен.",
 	"LISTS_GET_INDEX_GET": "вземи",
 	"LISTS_GET_INDEX_GET_REMOVE": "вземи и премахни",
 	"LISTS_GET_INDEX_REMOVE": "премахни",
diff --git a/msg/json/br.json b/msg/json/br.json
index 9c3a20f68..3de8cf8b8 100644
--- a/msg/json/br.json
+++ b/msg/json/br.json
@@ -176,7 +176,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Distreiñ an niver a lizherennoù(en ur gontañ an esaouennoù e-barzh) en destenn roet.",
 	"TEXT_ISEMPTY_TITLE": "%1 zo goullo",
 	"TEXT_ISEMPTY_TOOLTIP": "Adkas gwir m'eo goullo an destenn roet.",
-	"TEXT_INDEXOF_TOOLTIP": "Distreiñ meneger ar c'hentañ/an eil reveziadenn eus ar chadenn gentañ en eil chadenn. Distreiñ 0 ma n'eo ket kavet ar chadenn.",
+	"TEXT_INDEXOF_TOOLTIP": "Distreiñ meneger ar c'hentañ/an eil reveziadenn eus ar chadenn gentañ en eil chadenn. Distreiñ %1 ma n'eo ket kavet ar chadenn.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "en destenn",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "kavout reveziadenn gentañ an destenn",
 	"TEXT_INDEXOF_OPERATOR_LAST": "kavout reveziadenn diwezhañ an destenn",
@@ -226,7 +226,7 @@
 	"LISTS_INLIST": "el listenn",
 	"LISTS_INDEX_OF_FIRST": "kavout reveziadenn gentañ un elfenn",
 	"LISTS_INDEX_OF_LAST": "kavout reveziadenn diwezhañ un elfenn",
-	"LISTS_INDEX_OF_TOOLTIP": "Distreiñ meneger ar c'hentañ/an eil reveziadenn eus an elfenn en ul listenn. Distreiñ 0 ma n'eo ket kavet an destenn.",
+	"LISTS_INDEX_OF_TOOLTIP": "Distreiñ meneger ar c'hentañ/an eil reveziadenn eus an elfenn en ul listenn. Distreiñ %1 ma n'eo ket kavet an destenn.",
 	"LISTS_GET_INDEX_GET": "tapout",
 	"LISTS_GET_INDEX_GET_REMOVE": "tapout ha lemel",
 	"LISTS_GET_INDEX_REMOVE": "lemel",
diff --git a/msg/json/ca.json b/msg/json/ca.json
index 4a774d069..b2c40454f 100644
--- a/msg/json/ca.json
+++ b/msg/json/ca.json
@@ -175,7 +175,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Retorna el nombre de lletres (espais inclosos) en el text proporcionat.",
 	"TEXT_ISEMPTY_TITLE": "%1 està buit",
 	"TEXT_ISEMPTY_TOOLTIP": "Retorna cert si el text proporcionat està buit.",
-	"TEXT_INDEXOF_TOOLTIP": "Retorna l'índex de la primera/última aparició del primer text dins el segon. Retorna 0 si no es troba el text.",
+	"TEXT_INDEXOF_TOOLTIP": "Retorna l'índex de la primera/última aparició del primer text dins el segon. Retorna %1 si no es troba el text.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "en el text",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "trobar la primera aparició del text",
 	"TEXT_INDEXOF_OPERATOR_LAST": "trobar l'última aparició del text",
@@ -224,7 +224,7 @@
 	"LISTS_INLIST": "en la llista",
 	"LISTS_INDEX_OF_FIRST": "buscar primera aparició d'un element",
 	"LISTS_INDEX_OF_LAST": "buscar última aparició d'un element",
-	"LISTS_INDEX_OF_TOOLTIP": "Retorna l'índex de la primera/última aparició d'un element a la llista. Retorna 0 si no s'hi troba el text.",
+	"LISTS_INDEX_OF_TOOLTIP": "Retorna l'índex de la primera/última aparició d'un element a la llista. Retorna %1 si no s'hi troba el text.",
 	"LISTS_GET_INDEX_GET": "recupera",
 	"LISTS_GET_INDEX_GET_REMOVE": "recupera i esborra",
 	"LISTS_GET_INDEX_REMOVE": "esborra",
diff --git a/msg/json/cs.json b/msg/json/cs.json
index 13b3a2c24..0dabc4c3c 100644
--- a/msg/json/cs.json
+++ b/msg/json/cs.json
@@ -195,7 +195,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Vrátí počet písmen (včetně mezer) v zadaném textu.",
 	"TEXT_ISEMPTY_TITLE": "%1 je prázdný",
 	"TEXT_ISEMPTY_TOOLTIP": "Vrátí pravda pokud je zadaný text prázdný.",
-	"TEXT_INDEXOF_TOOLTIP": "Vrátí index prvního/posledního výskytu prvního textu v druhém textu.  Pokud text není nalezen, vrátí hodnotu 0.",
+	"TEXT_INDEXOF_TOOLTIP": "Vrátí index prvního/posledního výskytu prvního textu v druhém textu.  Pokud text není nalezen, vrátí hodnotu %1.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "v textu",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "najít první výskyt textu",
 	"TEXT_INDEXOF_OPERATOR_LAST": "najít poslední výskyt textu",
@@ -244,7 +244,7 @@
 	"LISTS_INLIST": "v seznamu",
 	"LISTS_INDEX_OF_FIRST": "najít první výskyt položky",
 	"LISTS_INDEX_OF_LAST": "najít poslední výskyt položky",
-	"LISTS_INDEX_OF_TOOLTIP": "Vrací index prvního/posledního výskytu položky v seznamu. Vrací 0, pokud položka nebyla nalezena.",
+	"LISTS_INDEX_OF_TOOLTIP": "Vrací index prvního/posledního výskytu položky v seznamu. Vrací %1, pokud položka nebyla nalezena.",
 	"LISTS_GET_INDEX_GET": "získat",
 	"LISTS_GET_INDEX_GET_REMOVE": "získat a odstranit",
 	"LISTS_GET_INDEX_REMOVE": "odstranit",
diff --git a/msg/json/da.json b/msg/json/da.json
index a5c51515d..ce9d241ae 100644
--- a/msg/json/da.json
+++ b/msg/json/da.json
@@ -178,7 +178,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Returnerer antallet af bogstaver (herunder mellemrum) i den angivne tekst.",
 	"TEXT_ISEMPTY_TITLE": "%1 er tom",
 	"TEXT_ISEMPTY_TOOLTIP": "Returnerer sand, hvis den angivne tekst er tom.",
-	"TEXT_INDEXOF_TOOLTIP": "Returnerer indeks for første/sidste forekomst af første tekst i den anden tekst.  Returnerer 0, hvis teksten ikke kan findes.",
+	"TEXT_INDEXOF_TOOLTIP": "Returnerer indeks for første/sidste forekomst af første tekst i den anden tekst.  Returnerer %1, hvis teksten ikke kan findes.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "i teksten",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "find første forekomst af teksten",
 	"TEXT_INDEXOF_OPERATOR_LAST": "find sidste forekomst af teksten",
@@ -227,7 +227,7 @@
 	"LISTS_INLIST": "i listen",
 	"LISTS_INDEX_OF_FIRST": "find første forekomst af elementet",
 	"LISTS_INDEX_OF_LAST": "find sidste forekomst af elementet",
-	"LISTS_INDEX_OF_TOOLTIP": "Returnerer indeks for første/sidste forekomst af elementet i listen. Returnerer 0, hvis elementet ikke kan findes.",
+	"LISTS_INDEX_OF_TOOLTIP": "Returnerer indeks for første/sidste forekomst af elementet i listen. Returnerer %1, hvis elementet ikke kan findes.",
 	"LISTS_GET_INDEX_GET": "hent",
 	"LISTS_GET_INDEX_GET_REMOVE": "hent og fjern",
 	"LISTS_GET_INDEX_REMOVE": "fjern",
diff --git a/msg/json/de.json b/msg/json/de.json
index dc5cfe81b..c2a6c433f 100644
--- a/msg/json/de.json
+++ b/msg/json/de.json
@@ -193,7 +193,7 @@
 	"TEXT_ISEMPTY_TITLE": "%1 ist leer",
 	"TEXT_ISEMPTY_TOOLTIP": "Ist wahr, falls der Text keine Zeichen enthält ist.",
 	"TEXT_INDEXOF_HELPURL": "http://publib.boulder.ibm.com/infocenter/lnxpcomp/v8v101/index.jsp?topic=%2Fcom.ibm.xlcpp8l.doc%2Flanguage%2Fref%2Farsubex.htm",
-	"TEXT_INDEXOF_TOOLTIP": "Findet das erste / letzte Auftreten eines Suchbegriffs in einem Text.  Gibt die Position des Begriffs zurück oder 0 falls der Suchbegriff nicht gefunden wurde.",
+	"TEXT_INDEXOF_TOOLTIP": "Findet das erste / letzte Auftreten eines Suchbegriffs in einem Text.  Gibt die Position des Begriffs zurück oder %1 falls der Suchbegriff nicht gefunden wurde.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "im Text",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "suche erstes Auftreten des Begriffs",
 	"TEXT_INDEXOF_OPERATOR_LAST": "suche letztes Auftreten des Begriffs",
@@ -251,7 +251,7 @@
 	"LISTS_INDEX_OF_HELPURL": "http://publib.boulder.ibm.com/infocenter/lnxpcomp/v8v101/index.jsp?topic=%2Fcom.ibm.xlcpp8l.doc%2Flanguage%2Fref%2Farsubex.htm",
 	"LISTS_INDEX_OF_FIRST": "suche erstes Auftreten von",
 	"LISTS_INDEX_OF_LAST": "suche letztes Auftreten von",
-	"LISTS_INDEX_OF_TOOLTIP": "Sucht die Position (Index) eines Elementes in der Liste. Gibt 0 zurück, falls kein Element gefunden wurde.",
+	"LISTS_INDEX_OF_TOOLTIP": "Sucht die Position (Index) eines Elementes in der Liste. Gibt %1 zurück, falls kein Element gefunden wurde.",
 	"LISTS_GET_INDEX_GET": "nimm",
 	"LISTS_GET_INDEX_GET_REMOVE": "nimm und entferne",
 	"LISTS_GET_INDEX_REMOVE": "entferne",
diff --git a/msg/json/el.json b/msg/json/el.json
index b2a566f8b..7828d901b 100644
--- a/msg/json/el.json
+++ b/msg/json/el.json
@@ -196,7 +196,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Επιστρέφει το πλήθος των γραμμάτων (συμπεριλαμβανομένων και των κενών διαστημάτων) στο παρεχόμενο κείμενο.",
 	"TEXT_ISEMPTY_TITLE": "το %1 είναι κενό",
 	"TEXT_ISEMPTY_TOOLTIP": "Επιστρέφει αληθής αν το παρεχόμενο κείμενο είναι κενό.",
-	"TEXT_INDEXOF_TOOLTIP": "Επιστρέφει τον δείκτη της πρώτης/τελευταίας εμφάνισης του πρώτου κειμένου στο δεύτερο κείμενο.  Επιστρέφει τιμή 0, αν δε βρει το κείμενο.",
+	"TEXT_INDEXOF_TOOLTIP": "Επιστρέφει τον δείκτη της πρώτης/τελευταίας εμφάνισης του πρώτου κειμένου στο δεύτερο κείμενο.  Επιστρέφει τιμή %1, αν δε βρει το κείμενο.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "στο κείμενο",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "βρες την πρώτη εμφάνιση του κειμένου",
 	"TEXT_INDEXOF_OPERATOR_LAST": "βρες την τελευταία εμφάνιση του κειμένου",
@@ -249,7 +249,7 @@
 	"LISTS_INDEX_OF_HELPURL": "Blockly",
 	"LISTS_INDEX_OF_FIRST": "βρες την πρώτη εμφάνιση του στοιχείου",
 	"LISTS_INDEX_OF_LAST": "βρες την τελευταία εμφάνιση του στοιχείου",
-	"LISTS_INDEX_OF_TOOLTIP": "Επιστρέφει τον δείκτη της πρώτης/τελευταίας εμφάνισης του στοιχείου στη λίστα.  Επιστρέφει τιμή 0, αν το στοιχείο δεν βρεθεί.",
+	"LISTS_INDEX_OF_TOOLTIP": "Επιστρέφει τον δείκτη της πρώτης/τελευταίας εμφάνισης του στοιχείου στη λίστα.  Επιστρέφει τιμή %1, αν το στοιχείο δεν βρεθεί.",
 	"LISTS_GET_INDEX_GET": "πάρε",
 	"LISTS_GET_INDEX_GET_REMOVE": "πάρε και αφαίρεσε",
 	"LISTS_GET_INDEX_REMOVE": "αφαίρεσε",
diff --git a/msg/json/en.json b/msg/json/en.json
index 428da7665..6dde1c413 100644
--- a/msg/json/en.json
+++ b/msg/json/en.json
@@ -208,7 +208,7 @@
 	"TEXT_ISEMPTY_TITLE": "%1 is empty",
 	"TEXT_ISEMPTY_TOOLTIP": "Returns true if the provided text is empty.",
 	"TEXT_INDEXOF_HELPURL": "https://github.com/google/blockly/wiki/Text#finding-text",
-	"TEXT_INDEXOF_TOOLTIP": "Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.",
+	"TEXT_INDEXOF_TOOLTIP": "Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "in text",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "find first occurrence of text",
 	"TEXT_INDEXOF_OPERATOR_LAST": "find last occurrence of text",
@@ -272,7 +272,7 @@
 	"LISTS_INDEX_OF_HELPURL": "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list",
 	"LISTS_INDEX_OF_FIRST": "find first occurrence of item",
 	"LISTS_INDEX_OF_LAST": "find last occurrence of item",
-	"LISTS_INDEX_OF_TOOLTIP": "Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.",
+	"LISTS_INDEX_OF_TOOLTIP": "Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.",
 	"LISTS_GET_INDEX_GET": "get",
 	"LISTS_GET_INDEX_GET_REMOVE": "get and remove",
 	"LISTS_GET_INDEX_REMOVE": "remove",
diff --git a/msg/json/es.json b/msg/json/es.json
index 09f1222be..415c8b11e 100644
--- a/msg/json/es.json
+++ b/msg/json/es.json
@@ -184,7 +184,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Devuelve el número de letras (incluyendo espacios) en el texto proporcionado.",
 	"TEXT_ISEMPTY_TITLE": "%1 está vacío",
 	"TEXT_ISEMPTY_TOOLTIP": "Devuelve verdadero si el texto proporcionado está vacío.",
-	"TEXT_INDEXOF_TOOLTIP": "Devuelve el índice de la primera/última aparición del primer texto en el segundo texto. Devuelve 0 si el texto no se encuentra.",
+	"TEXT_INDEXOF_TOOLTIP": "Devuelve el índice de la primera/última aparición del primer texto en el segundo texto. Devuelve %1 si el texto no se encuentra.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "en el texto",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "encontrar la primera aparición del texto",
 	"TEXT_INDEXOF_OPERATOR_LAST": "encontrar la última aparición del texto",
@@ -234,7 +234,7 @@
 	"LISTS_INLIST": "en la lista",
 	"LISTS_INDEX_OF_FIRST": "encontrar la primera aparición del elemento",
 	"LISTS_INDEX_OF_LAST": "encontrar la última aparición del elemento",
-	"LISTS_INDEX_OF_TOOLTIP": "Devuelve el índice de la primera/última aparición del elemento en la lista. Devuelve 0 si el elemento no se encuentra.",
+	"LISTS_INDEX_OF_TOOLTIP": "Devuelve el índice de la primera/última aparición del elemento en la lista. Devuelve %1 si el elemento no se encuentra.",
 	"LISTS_GET_INDEX_GET": "obtener",
 	"LISTS_GET_INDEX_GET_REMOVE": "obtener y eliminar",
 	"LISTS_GET_INDEX_REMOVE": "eliminar",
diff --git a/msg/json/fa.json b/msg/json/fa.json
index 3bd802bd8..c876657ac 100644
--- a/msg/json/fa.json
+++ b/msg/json/fa.json
@@ -182,7 +182,7 @@
 	"TEXT_LENGTH_TOOLTIP": "بازگرداندن عددی از حروف (شامل فاصله‌ها) در متن فراهم‌شده.",
 	"TEXT_ISEMPTY_TITLE": "%1 خالی است",
 	"TEXT_ISEMPTY_TOOLTIP": "اضافه‌کردن صحیح اگر متن فراهم‌شده خالی است.",
-	"TEXT_INDEXOF_TOOLTIP": "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد ۰ باز می‌گرداند.",
+	"TEXT_INDEXOF_TOOLTIP": "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد %1 باز می‌گرداند.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "در متن",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "اولین رخداد متن را بیاب",
 	"TEXT_INDEXOF_OPERATOR_LAST": "آخرین رخداد متن را بیاب",
@@ -231,7 +231,7 @@
 	"LISTS_INLIST": "در فهرست",
 	"LISTS_INDEX_OF_FIRST": "یافتن اولین رخ‌داد مورد",
 	"LISTS_INDEX_OF_LAST": "یافتن آخرین رخ‌داد مورد",
-	"LISTS_INDEX_OF_TOOLTIP": "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. ۰ بر می‌گرداند اگر آیتم موجود نبود.",
+	"LISTS_INDEX_OF_TOOLTIP": "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. %1 بر می‌گرداند اگر آیتم موجود نبود.",
 	"LISTS_GET_INDEX_GET": "گرفتن",
 	"LISTS_GET_INDEX_GET_REMOVE": "گرفتن و حذف‌کردن",
 	"LISTS_GET_INDEX_REMOVE": "حذف‌کردن",
diff --git a/msg/json/fi.json b/msg/json/fi.json
index 815bd26ea..5cc7444d0 100644
--- a/msg/json/fi.json
+++ b/msg/json/fi.json
@@ -196,7 +196,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Palauttaa annetussa tekstissä olevien merkkien määrän (välilyönnit mukaan lukien).",
 	"TEXT_ISEMPTY_TITLE": "%1 on tyhjä",
 	"TEXT_ISEMPTY_TOOLTIP": "Palauttaa tosi, jos annettu teksti on tyhjä.",
-	"TEXT_INDEXOF_TOOLTIP": "Palauttaa ensin annetun tekstin ensimmäisen/viimeisen esiintymän osoitteen toisessa tekstissä. Palauttaa osoitteen 0 jos tekstiä ei löytynyt.",
+	"TEXT_INDEXOF_TOOLTIP": "Palauttaa ensin annetun tekstin ensimmäisen/viimeisen esiintymän osoitteen toisessa tekstissä. Palauttaa osoitteen %1 jos tekstiä ei löytynyt.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "tekstistä",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "etsi ensimmäinen esiintymä merkkijonolle",
 	"TEXT_INDEXOF_OPERATOR_LAST": "etsi viimeinen esiintymä merkkijonolle",
@@ -245,7 +245,7 @@
 	"LISTS_INLIST": "listassa",
 	"LISTS_INDEX_OF_FIRST": "etsi ensimmäinen esiintymä kohteelle",
 	"LISTS_INDEX_OF_LAST": "etsi viimeinen esiintymä kohteelle",
-	"LISTS_INDEX_OF_TOOLTIP": "Palauttaa kohteen ensimmäisen/viimeisen esiintymän kohdan. Palauttaa 0 jos tekstiä ei löydy.",
+	"LISTS_INDEX_OF_TOOLTIP": "Palauttaa kohteen ensimmäisen/viimeisen esiintymän kohdan. Palauttaa %1 jos tekstiä ei löydy.",
 	"LISTS_GET_INDEX_GET": "hae",
 	"LISTS_GET_INDEX_GET_REMOVE": "hae ja poista",
 	"LISTS_GET_INDEX_REMOVE": "poista",
diff --git a/msg/json/fr.json b/msg/json/fr.json
index 7e0450fde..2a684b680 100644
--- a/msg/json/fr.json
+++ b/msg/json/fr.json
@@ -187,7 +187,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Renvoie le nombre de lettres (espaces compris) dans le texte fourni.",
 	"TEXT_ISEMPTY_TITLE": "%1 est vide",
 	"TEXT_ISEMPTY_TOOLTIP": "Renvoie vrai si le texte fourni est vide.",
-	"TEXT_INDEXOF_TOOLTIP": "Renvoie l’index de la première/dernière occurrence de la première chaîne dans la seconde. Renvoie 0 si la chaîne n’est pas trouvée.",
+	"TEXT_INDEXOF_TOOLTIP": "Renvoie l’index de la première/dernière occurrence de la première chaîne dans la seconde. Renvoie %1 si la chaîne n’est pas trouvée.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "dans le texte",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "trouver la première occurrence de la chaîne",
 	"TEXT_INDEXOF_OPERATOR_LAST": "trouver la dernière occurrence de la chaîne",
@@ -237,7 +237,7 @@
 	"LISTS_INLIST": "dans la liste",
 	"LISTS_INDEX_OF_FIRST": "trouver la première occurrence de l’élément",
 	"LISTS_INDEX_OF_LAST": "trouver la dernière occurrence de l’élément",
-	"LISTS_INDEX_OF_TOOLTIP": "Renvoie l’index de la première/dernière occurrence de l’élément dans la liste. Renvoie 0 si l'élément n'est pas trouvé.",
+	"LISTS_INDEX_OF_TOOLTIP": "Renvoie l’index de la première/dernière occurrence de l’élément dans la liste. Renvoie %1 si l'élément n'est pas trouvé.",
 	"LISTS_GET_INDEX_GET": "obtenir",
 	"LISTS_GET_INDEX_GET_REMOVE": "obtenir et supprimer",
 	"LISTS_GET_INDEX_REMOVE": "supprimer",
diff --git a/msg/json/he.json b/msg/json/he.json
index df863597f..d74c63836 100644
--- a/msg/json/he.json
+++ b/msg/json/he.json
@@ -199,7 +199,7 @@
 	"LISTS_INLIST": "ברשימה",
 	"LISTS_INDEX_OF_FIRST": "מחזירה את המיקום הראשון של פריט ברשימה",
 	"LISTS_INDEX_OF_LAST": "מחזירה את המיקום האחרון של פריט ברשימה",
-	"LISTS_INDEX_OF_TOOLTIP": "מחזירה את האינדקס של המופע ראשון/אחרון של הפריט ברשימה.  מחזירה 0 אם הפריט אינו נמצא.",
+	"LISTS_INDEX_OF_TOOLTIP": "מחזירה את האינדקס של המופע ראשון/אחרון של הפריט ברשימה.  מחזירה %1 אם הפריט אינו נמצא.",
 	"LISTS_GET_INDEX_GET": "לקבל",
 	"LISTS_GET_INDEX_GET_REMOVE": "קבל ומחק",
 	"LISTS_GET_INDEX_REMOVE": "הסרה",
diff --git a/msg/json/hrx.json b/msg/json/hrx.json
index d42be99a9..df92db83f 100644
--- a/msg/json/hrx.json
+++ b/msg/json/hrx.json
@@ -172,7 +172,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Die Oonzoohl von Zeiche in enem Text. (inkl. Leerzeiche)",
 	"TEXT_ISEMPTY_TITLE": "%1 ist leer?",
 	"TEXT_ISEMPTY_TOOLTIP": "Ist woahr (true), wenn der Text leer ist.",
-	"TEXT_INDEXOF_TOOLTIP": "Findt das earste / letzte Voarkommniss von en Suchbegriffes in enem Text.  Gebt die Position von dem Begriff orrer 0 zurück.",
+	"TEXT_INDEXOF_TOOLTIP": "Findt das earste / letzte Voarkommniss von en Suchbegriffes in enem Text.  Gebt die Position von dem Begriff orrer %1 zurück.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "im Text",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "Such der Begriff sein earstes Voarkommniss",
 	"TEXT_INDEXOF_OPERATOR_LAST": "Suche der Begriff sein letztes Vorkommniss.",
@@ -221,7 +221,7 @@
 	"LISTS_INLIST": "in der List",
 	"LISTS_INDEX_OF_FIRST": "Such earstes Voarkommniss",
 	"LISTS_INDEX_OF_LAST": "Such letztes Voarkommniss",
-	"LISTS_INDEX_OF_TOOLTIP": "Sucht die Position (index) von en Element in der List Gebt 0 zurück wenn nixs gefunn woard.",
+	"LISTS_INDEX_OF_TOOLTIP": "Sucht die Position (index) von en Element in der List Gebt %1 zurück wenn nixs gefunn woard.",
 	"LISTS_GET_INDEX_GET": "Nehm",
 	"LISTS_GET_INDEX_GET_REMOVE": "Nehm und entfern",
 	"LISTS_GET_INDEX_REMOVE": "Entfern",
diff --git a/msg/json/hu.json b/msg/json/hu.json
index 8dd2c4699..dafeaa315 100644
--- a/msg/json/hu.json
+++ b/msg/json/hu.json
@@ -186,7 +186,7 @@
 	"TEXT_LENGTH_TOOLTIP": "A megadott szöveg karaktereinek számát adja eredményül (beleértve a szóközöket).",
 	"TEXT_ISEMPTY_TITLE": "%1 üres",
 	"TEXT_ISEMPTY_TOOLTIP": "Igaz, ha a vizsgált szöveg hossza 0.",
-	"TEXT_INDEXOF_TOOLTIP": "A keresett szöveg első vagy utolsó előfordulásával tér vissza.  0 esetén a szövegrészlet nem található.",
+	"TEXT_INDEXOF_TOOLTIP": "A keresett szöveg első vagy utolsó előfordulásával tér vissza.  %1 esetén a szövegrészlet nem található.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "A(z)",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "szövegben az első előfordulásának helye",
 	"TEXT_INDEXOF_OPERATOR_LAST": "szövegben az utolsó előfordulásának helye",
@@ -238,7 +238,7 @@
 	"LISTS_INLIST": "A(z)",
 	"LISTS_INDEX_OF_FIRST": "listában első előfordulásaː",
 	"LISTS_INDEX_OF_LAST": "listában utolsó előfordulásaː",
-	"LISTS_INDEX_OF_TOOLTIP": "A megadott elem első vagy utolsó előfordulásával tér vissza. 0-val tér vissza, ha nem talál ilyen elemet.",
+	"LISTS_INDEX_OF_TOOLTIP": "A megadott elem első vagy utolsó előfordulásával tér vissza. %1-val tér vissza, ha nem talál ilyen elemet.",
 	"LISTS_GET_INDEX_GET": "listából értéke",
 	"LISTS_GET_INDEX_GET_REMOVE": "listából kivétele",
 	"LISTS_GET_INDEX_REMOVE": "listából törlése",
diff --git a/msg/json/ia.json b/msg/json/ia.json
index f75e7a35e..def2224c0 100644
--- a/msg/json/ia.json
+++ b/msg/json/ia.json
@@ -169,7 +169,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Retorna le numero de litteras (incluse spatios) in le texto fornite.",
 	"TEXT_ISEMPTY_TITLE": "%1 es vacue",
 	"TEXT_ISEMPTY_TOOLTIP": "Retorna ver si le texto fornite es vacue.",
-	"TEXT_INDEXOF_TOOLTIP": "Retorna le indice del prime/ultime occurrentia del prime texto in le secunde texto. Retorna 0 si le texto non es trovate.",
+	"TEXT_INDEXOF_TOOLTIP": "Retorna le indice del prime/ultime occurrentia del prime texto in le secunde texto. Retorna %1 si le texto non es trovate.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "in le texto",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "cercar le prime occurrentia del texto",
 	"TEXT_INDEXOF_OPERATOR_LAST": "cercar le ultime occurrentia del texto",
@@ -218,7 +218,7 @@
 	"LISTS_INLIST": "in lista",
 	"LISTS_INDEX_OF_FIRST": "cercar le prime occurrentia del elemento",
 	"LISTS_INDEX_OF_LAST": "cercar le ultime occurrentia del elemento",
-	"LISTS_INDEX_OF_TOOLTIP": "Retorna le indice del prime/ultime occurrentia del elemento in le lista. Retorna 0 si le texto non es trovate.",
+	"LISTS_INDEX_OF_TOOLTIP": "Retorna le indice del prime/ultime occurrentia del elemento in le lista. Retorna %1 si le texto non es trovate.",
 	"LISTS_GET_INDEX_GET": "prender",
 	"LISTS_GET_INDEX_GET_REMOVE": "prender e remover",
 	"LISTS_GET_INDEX_REMOVE": "remover",
diff --git a/msg/json/id.json b/msg/json/id.json
index 4fe972ea4..d0cc08d18 100644
--- a/msg/json/id.json
+++ b/msg/json/id.json
@@ -196,7 +196,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Kembalikan sejumlah huruf (termasuk spasi) dari teks yang disediakan.",
 	"TEXT_ISEMPTY_TITLE": "%1 kosong",
 	"TEXT_ISEMPTY_TOOLTIP": "Kembalikan benar jika teks yang disediakan kosong.",
-	"TEXT_INDEXOF_TOOLTIP": "Kembalikan indeks pertama dan terakhir dari kejadian pertama/terakhir dari teks pertama dalam teks kedua.  Kembalikan 0 jika teks tidak ditemukan.",
+	"TEXT_INDEXOF_TOOLTIP": "Kembalikan indeks pertama dan terakhir dari kejadian pertama/terakhir dari teks pertama dalam teks kedua.  Kembalikan %1 jika teks tidak ditemukan.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "dalam teks",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "temukan kejadian pertama dalam teks",
 	"TEXT_INDEXOF_OPERATOR_LAST": "temukan kejadian terakhir dalam teks",
@@ -246,7 +246,7 @@
 	"LISTS_INLIST": "dalam list",
 	"LISTS_INDEX_OF_FIRST": "cari kejadian pertama item",
 	"LISTS_INDEX_OF_LAST": "cari kejadian terakhir item",
-	"LISTS_INDEX_OF_TOOLTIP": "Kembalikan indeks dari item pertama/terakhir kali muncul dalam list. Kembalikan 0 jika item tidak ditemukan.",
+	"LISTS_INDEX_OF_TOOLTIP": "Kembalikan indeks dari item pertama/terakhir kali muncul dalam list. Kembalikan %1 jika item tidak ditemukan.",
 	"LISTS_GET_INDEX_GET": "dapatkan",
 	"LISTS_GET_INDEX_GET_REMOVE": "dapatkan dan hapus",
 	"LISTS_GET_INDEX_REMOVE": "Hapus",
diff --git a/msg/json/is.json b/msg/json/is.json
index 2e8f2451a..8f25aca31 100644
--- a/msg/json/is.json
+++ b/msg/json/is.json
@@ -207,7 +207,7 @@
 	"TEXT_ISEMPTY_TITLE": "%1 er tómur",
 	"TEXT_ISEMPTY_TOOLTIP": "Skilar sönnu ef gefni textinn er tómur.",
 	"TEXT_INDEXOF_HELPURL": "https://github.com/google/blockly/wiki/Text#finding-text",
-	"TEXT_INDEXOF_TOOLTIP": "Finnur fyrsta/síðasta tilfelli fyrri textans í seinni textanum og skilar sæti hans. Skilar 0 ef textinn finnst ekki.",
+	"TEXT_INDEXOF_TOOLTIP": "Finnur fyrsta/síðasta tilfelli fyrri textans í seinni textanum og skilar sæti hans. Skilar %1 ef textinn finnst ekki.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "í texta",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "finna fyrsta tilfelli texta",
 	"TEXT_INDEXOF_OPERATOR_LAST": "finna síðasta tilfelli texta",
@@ -266,7 +266,7 @@
 	"LISTS_INDEX_OF_HELPURL": "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list",
 	"LISTS_INDEX_OF_FIRST": "finna fyrsta tilfelli atriðis",
 	"LISTS_INDEX_OF_LAST": "finna síðasta tilfelli atriðis",
-	"LISTS_INDEX_OF_TOOLTIP": "Finnur hvar atriðið kemur fyrir fyrst/síðast í listanum og skilar sæti þess. Skilar 0 ef atriðið finnst ekki.",
+	"LISTS_INDEX_OF_TOOLTIP": "Finnur hvar atriðið kemur fyrir fyrst/síðast í listanum og skilar sæti þess. Skilar %1 ef atriðið finnst ekki.",
 	"LISTS_GET_INDEX_GET": "sækja",
 	"LISTS_GET_INDEX_GET_REMOVE": "sækja og fjarlægja",
 	"LISTS_GET_INDEX_REMOVE": "fjarlægja",
diff --git a/msg/json/it.json b/msg/json/it.json
index 209677d38..1675f6b44 100644
--- a/msg/json/it.json
+++ b/msg/json/it.json
@@ -182,7 +182,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Restituisce il numero di lettere (inclusi gli spazi) nel testo fornito.",
 	"TEXT_ISEMPTY_TITLE": "%1 è vuoto",
 	"TEXT_ISEMPTY_TOOLTIP": "Restituisce vero se il testo fornito è vuoto.",
-	"TEXT_INDEXOF_TOOLTIP": "Restituisce l'indice della prima occorrenza del primo testo all'interno del secondo testo. Restituisce 0 se il testo non viene trovato.",
+	"TEXT_INDEXOF_TOOLTIP": "Restituisce l'indice della prima occorrenza del primo testo all'interno del secondo testo. Restituisce %1 se il testo non viene trovato.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "nel testo",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "trova la prima occorrenza del testo",
 	"TEXT_INDEXOF_OPERATOR_LAST": "trova l'ultima occorrenza del testo",
@@ -231,7 +231,7 @@
 	"LISTS_INLIST": "nella lista",
 	"LISTS_INDEX_OF_FIRST": "trova la prima occorrenza dell'elemento",
 	"LISTS_INDEX_OF_LAST": "trova l'ultima occorrenza dell'elemento",
-	"LISTS_INDEX_OF_TOOLTIP": "Restituisce l'indice della prima/ultima occorrenza dell'elemento nella lista. Restituisce 0 se l'elemento non viene trovato.",
+	"LISTS_INDEX_OF_TOOLTIP": "Restituisce l'indice della prima/ultima occorrenza dell'elemento nella lista. Restituisce %1 se l'elemento non viene trovato.",
 	"LISTS_GET_INDEX_GET": "prendi",
 	"LISTS_GET_INDEX_GET_REMOVE": "prendi e rimuovi",
 	"LISTS_GET_INDEX_REMOVE": "rimuovi",
diff --git a/msg/json/ja.json b/msg/json/ja.json
index 169d27b51..4bd9617bc 100644
--- a/msg/json/ja.json
+++ b/msg/json/ja.json
@@ -197,7 +197,7 @@
 	"TEXT_LENGTH_TOOLTIP": "指定されたテキストの文字 (スペースを含む) の数を返します。",
 	"TEXT_ISEMPTY_TITLE": "%1 が空",
 	"TEXT_ISEMPTY_TOOLTIP": "指定されたテキストが空の場合は、true を返します。",
-	"TEXT_INDEXOF_TOOLTIP": "最初のテキストの二番目のてきすとの、最初と最後の、出現したインデックスをかえします。テキストが見つからない場合は 0 を返します。",
+	"TEXT_INDEXOF_TOOLTIP": "最初のテキストの二番目のてきすとの、最初と最後の、出現したインデックスをかえします。テキストが見つからない場合は %1 を返します。",
 	"TEXT_INDEXOF_INPUT_INTEXT": "テキストで",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "テキストの最初の出現箇所を検索します。",
 	"TEXT_INDEXOF_OPERATOR_LAST": "テキストの最後に見つかったを検索します。",
@@ -250,7 +250,7 @@
 	"LISTS_INLIST": "リストで",
 	"LISTS_INDEX_OF_FIRST": "最初に見つかった項目を検索します。",
 	"LISTS_INDEX_OF_LAST": "最後に見つかったアイテムを見つける",
-	"LISTS_INDEX_OF_TOOLTIP": "リスト項目の最初/最後に出現するインデックス位置を返します。項目が見つからない場合は 0 を返します。",
+	"LISTS_INDEX_OF_TOOLTIP": "リスト項目の最初/最後に出現するインデックス位置を返します。項目が見つからない場合は %1 を返します。",
 	"LISTS_GET_INDEX_GET": "取得",
 	"LISTS_GET_INDEX_GET_REMOVE": "取得と削除",
 	"LISTS_GET_INDEX_REMOVE": "削除",
diff --git a/msg/json/ko.json b/msg/json/ko.json
index 77fe992c4..746a972ad 100644
--- a/msg/json/ko.json
+++ b/msg/json/ko.json
@@ -214,7 +214,7 @@
 	"TEXT_ISEMPTY_TITLE": "%1이 비어 있습니다",
 	"TEXT_ISEMPTY_TOOLTIP": "입력된 문장이, 빈 문장(\"\")이면 참(true) 값을 돌려줍니다.",
 	"TEXT_INDEXOF_HELPURL": "https://github.com/google/blockly/wiki/Text#finding-text",
-	"TEXT_INDEXOF_TOOLTIP": "어떤 문장이 가장 처음 나타난 위치 또는, 가장 마지막으로 나타난 위치를 찾아 돌려줍니다. 찾는 문장이 없는 경우는 0 값을 돌려줌.",
+	"TEXT_INDEXOF_TOOLTIP": "어떤 문장이 가장 처음 나타난 위치 또는, 가장 마지막으로 나타난 위치를 찾아 돌려줍니다. 찾는 문장이 없는 경우는 %1 값을 돌려줌.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "문장",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "에서 다음 문장이 처음으로 나타난 위치 찾기 :",
 	"TEXT_INDEXOF_OPERATOR_LAST": "에서 다음 문장이 마지막으로 나타난 위치 찾기 :",
@@ -278,7 +278,7 @@
 	"LISTS_INDEX_OF_HELPURL": "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list",
 	"LISTS_INDEX_OF_FIRST": "처음으로 나타난 위치",
 	"LISTS_INDEX_OF_LAST": "마지막으로 나타난 위치",
-	"LISTS_INDEX_OF_TOOLTIP": "아이템이 나타난 처음 또는 마지막 위치를 찾아 돌려줍니다. 아이템이 없으면 0이 반환됩니다.",
+	"LISTS_INDEX_OF_TOOLTIP": "아이템이 나타난 처음 또는 마지막 위치를 찾아 돌려줍니다. 아이템이 없으면 %1이 반환됩니다.",
 	"LISTS_GET_INDEX_GET": "가져오기",
 	"LISTS_GET_INDEX_GET_REMOVE": "잘라 내기",
 	"LISTS_GET_INDEX_REMOVE": "삭제",
diff --git a/msg/json/lki.json b/msg/json/lki.json
index c90e64f13..29cffc1c7 100644
--- a/msg/json/lki.json
+++ b/msg/json/lki.json
@@ -175,7 +175,7 @@
 	"TEXT_LENGTH_TOOLTIP": "بازگرداندن عددی از حروف (شامل فاصله‌ها) در متن فراهم‌شده.",
 	"TEXT_ISEMPTY_TITLE": "%1 خالی است",
 	"TEXT_ISEMPTY_TOOLTIP": "اضافه‌کردن صحیح اگر متن فراهم‌شده خالی است.",
-	"TEXT_INDEXOF_TOOLTIP": "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد ۰ باز می‌گرداند.",
+	"TEXT_INDEXOF_TOOLTIP": "شاخصی از اولین آخرین رخ‌داد متن اول در متن دوم بر می‌گرداند. اگر متن یافت نشد %1 باز می‌گرداند.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "در متن",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "اولین رخداد متن را بیاب",
 	"TEXT_INDEXOF_OPERATOR_LAST": "آخرین رخداد متن را بیاب",
@@ -224,7 +224,7 @@
 	"LISTS_INLIST": "در فهرست",
 	"LISTS_INDEX_OF_FIRST": "یافتن اولین رخ‌داد مورد",
 	"LISTS_INDEX_OF_LAST": "یافتن آخرین رخ‌داد مورد",
-	"LISTS_INDEX_OF_TOOLTIP": "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. ۰ بر می‌گرداند اگر آیتم موجود نبود.",
+	"LISTS_INDEX_OF_TOOLTIP": "شاخصی از اولین/آخرین رخ‌داد مورد در فهرست را بر می‌گرداند. %1 بر می‌گرداند اگر آیتم موجود نبود.",
 	"LISTS_GET_INDEX_GET": "گِرتِن",
 	"LISTS_GET_INDEX_GET_REMOVE": "گِرتِن و حةذف کردن",
 	"LISTS_GET_INDEX_REMOVE": "حةذف کردن",
diff --git a/msg/json/lt.json b/msg/json/lt.json
index b034e797a..58ddf6f43 100644
--- a/msg/json/lt.json
+++ b/msg/json/lt.json
@@ -187,7 +187,7 @@
 	"LISTS_INLIST": "sąraše",
 	"LISTS_INDEX_OF_FIRST": "rask pirmą reikšmę",
 	"LISTS_INDEX_OF_LAST": "rask paskutinę reikšmę",
-	"LISTS_INDEX_OF_TOOLTIP": "Grąžina pirmos/paskutinės reikšmės eilės nr. sąraše. Grąžina 0, jei reikšmės neranda.",
+	"LISTS_INDEX_OF_TOOLTIP": "Grąžina pirmos/paskutinės reikšmės eilės nr. sąraše. Grąžina %1, jei reikšmės neranda.",
 	"LISTS_GET_INDEX_GET": "paimk",
 	"LISTS_GET_INDEX_GET_REMOVE": "paimk ir ištrink",
 	"LISTS_GET_INDEX_REMOVE": "pašalinti",
diff --git a/msg/json/ms.json b/msg/json/ms.json
index 6f78dc90e..44a4f794c 100644
--- a/msg/json/ms.json
+++ b/msg/json/ms.json
@@ -186,7 +186,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Kembalikan jumlah huruf (termasuk ruang) dalam teks yang disediakan.",
 	"TEXT_ISEMPTY_TITLE": "%1 adalah kosong",
 	"TEXT_ISEMPTY_TOOLTIP": "Kembalikan benar jika teks yang disediakan adalah kosong.",
-	"TEXT_INDEXOF_TOOLTIP": "Kembalikan Indeks kejadian pertama/terakhir dari teks pertama ke dalam teks kedua.  Kembalikan 0 Jika teks tidak ditemui.",
+	"TEXT_INDEXOF_TOOLTIP": "Kembalikan Indeks kejadian pertama/terakhir dari teks pertama ke dalam teks kedua.  Kembalikan %1 Jika teks tidak ditemui.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "dalam teks",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "mencari kejadian pertama teks",
 	"TEXT_INDEXOF_OPERATOR_LAST": "mencari kejadian terakhir teks",
@@ -236,7 +236,7 @@
 	"LISTS_INLIST": "dalam senarai",
 	"LISTS_INDEX_OF_FIRST": "cari pertama item kejadian",
 	"LISTS_INDEX_OF_LAST": "cari kejadian akhir item",
-	"LISTS_INDEX_OF_TOOLTIP": "Menyatakan indeks kejadian pertama/terakhir item berkenaan dalam senarai. Menyatakan 0 jika item berkenaan tidak ditemui.",
+	"LISTS_INDEX_OF_TOOLTIP": "Menyatakan indeks kejadian pertama/terakhir item berkenaan dalam senarai. Menyatakan %1 jika item berkenaan tidak ditemui.",
 	"LISTS_GET_INDEX_GET": "dapatkan",
 	"LISTS_GET_INDEX_GET_REMOVE": "dapat dan alihkan",
 	"LISTS_GET_INDEX_REMOVE": "alihkan",
diff --git a/msg/json/nb.json b/msg/json/nb.json
index adee7100f..99bd64921 100644
--- a/msg/json/nb.json
+++ b/msg/json/nb.json
@@ -193,7 +193,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Returnerer antall bokstaver (inkludert mellomrom) i den angitte teksten.",
 	"TEXT_ISEMPTY_TITLE": "%1 er tom",
 	"TEXT_ISEMPTY_TOOLTIP": "Returnerer sann hvis den angitte teksten er tom.",
-	"TEXT_INDEXOF_TOOLTIP": "Returnerer posisjonen for første/siste forekomsten av den første tekst i den andre teksten.  Returnerer 0 hvis teksten ikke blir funnet.",
+	"TEXT_INDEXOF_TOOLTIP": "Returnerer posisjonen for første/siste forekomsten av den første tekst i den andre teksten.  Returnerer %1 hvis teksten ikke blir funnet.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "i tekst",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "finn første forekomst av tekst",
 	"TEXT_INDEXOF_OPERATOR_LAST": "finn siste forekomst av tekst",
@@ -246,7 +246,7 @@
 	"LISTS_INLIST": "i listen",
 	"LISTS_INDEX_OF_FIRST": "finn første forekomst av elementet",
 	"LISTS_INDEX_OF_LAST": "finn siste forekomst av elementet",
-	"LISTS_INDEX_OF_TOOLTIP": "Returnerer indeksen av den første/siste forekomsten av elementet i lista. Returnerer 0 hvis ikke funnet.",
+	"LISTS_INDEX_OF_TOOLTIP": "Returnerer indeksen av den første/siste forekomsten av elementet i lista. Returnerer %1 hvis ikke funnet.",
 	"LISTS_GET_INDEX_GET": "hent",
 	"LISTS_GET_INDEX_GET_REMOVE": "hent og fjern",
 	"LISTS_GET_INDEX_REMOVE": "fjern",
diff --git a/msg/json/nl.json b/msg/json/nl.json
index d1326a00a..6f204bb22 100644
--- a/msg/json/nl.json
+++ b/msg/json/nl.json
@@ -211,7 +211,7 @@
 	"TEXT_ISEMPTY_TITLE": "%1 is leeg",
 	"TEXT_ISEMPTY_TOOLTIP": "Geeft \"waar\" terug, als de opgegeven tekst leeg is.",
 	"TEXT_INDEXOF_HELPURL": "https://github.com/google/blockly/wiki/Text#finding-text",
-	"TEXT_INDEXOF_TOOLTIP": "Geeft de index terug van de eerste/laatste aanwezigheid van de eerste tekst in de tweede tekst. Geeft 0 terug als de tekst niet gevonden is.",
+	"TEXT_INDEXOF_TOOLTIP": "Geeft de index terug van de eerste/laatste aanwezigheid van de eerste tekst in de tweede tekst. Geeft %1 terug als de tekst niet gevonden is.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "in tekst",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "zoek eerste voorkomen van tekst",
 	"TEXT_INDEXOF_OPERATOR_LAST": "zoek het laatste voorkomen van tekst",
@@ -270,7 +270,7 @@
 	"LISTS_INDEX_OF_HELPURL": "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list",
 	"LISTS_INDEX_OF_FIRST": "zoek eerste voorkomen van item",
 	"LISTS_INDEX_OF_LAST": "zoek laatste voorkomen van item",
-	"LISTS_INDEX_OF_TOOLTIP": "Geeft de index terug van het eerste of laatste voorkomen van een item in de lijst. Geeft 0 terug als het item niet is gevonden.",
+	"LISTS_INDEX_OF_TOOLTIP": "Geeft de index terug van het eerste of laatste voorkomen van een item in de lijst. Geeft %1 terug als het item niet is gevonden.",
 	"LISTS_GET_INDEX_GET": "haal op",
 	"LISTS_GET_INDEX_GET_REMOVE": "haal op en verwijder",
 	"LISTS_GET_INDEX_REMOVE": "verwijder",
diff --git a/msg/json/pl.json b/msg/json/pl.json
index cda271e14..df078a0e6 100644
--- a/msg/json/pl.json
+++ b/msg/json/pl.json
@@ -202,7 +202,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Zwraca liczbę liter (łącznie ze spacjami) w podanym tekście.",
 	"TEXT_ISEMPTY_TITLE": "%1 jest pusty",
 	"TEXT_ISEMPTY_TOOLTIP": "Zwraca prawda (true), jeśli podany tekst jest pusty.",
-	"TEXT_INDEXOF_TOOLTIP": "Zwraca indeks pierwszego/ostatniego wystąpienia pierwszego tekstu w drugim tekście. Zwraca wartość 0, jeśli tekst nie został znaleziony.",
+	"TEXT_INDEXOF_TOOLTIP": "Zwraca indeks pierwszego/ostatniego wystąpienia pierwszego tekstu w drugim tekście. Zwraca wartość %1, jeśli tekst nie został znaleziony.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "w tekście",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "znajdź pierwsze wystąpienie tekstu",
 	"TEXT_INDEXOF_OPERATOR_LAST": "znajdź ostatnie wystąpienie tekstu",
@@ -255,7 +255,7 @@
 	"LISTS_INLIST": "na liście",
 	"LISTS_INDEX_OF_FIRST": "znaleźć pierwsze wystąpienie elementu",
 	"LISTS_INDEX_OF_LAST": "znajduje ostatanie wystąpienie elementu",
-	"LISTS_INDEX_OF_TOOLTIP": "Zwraca indeks pierwszego/ostatniego wystąpienia elementu na liście. Zwraca wartość 0, jeśli tekst nie zostanie znaleziony.",
+	"LISTS_INDEX_OF_TOOLTIP": "Zwraca indeks pierwszego/ostatniego wystąpienia elementu na liście. Zwraca wartość %1, jeśli tekst nie zostanie znaleziony.",
 	"LISTS_GET_INDEX_GET": "pobierz",
 	"LISTS_GET_INDEX_GET_REMOVE": "Pobierz i usuń",
 	"LISTS_GET_INDEX_REMOVE": "usuń",
diff --git a/msg/json/pms.json b/msg/json/pms.json
index 4c317341f..3710e5f24 100644
--- a/msg/json/pms.json
+++ b/msg/json/pms.json
@@ -176,7 +176,7 @@
 	"TEXT_LENGTH_TOOLTIP": "A smon ël nùmer ëd litre (spassi comprèis) ant ël test fornì.",
 	"TEXT_ISEMPTY_TITLE": "%1 a l'é veuid",
 	"TEXT_ISEMPTY_TOOLTIP": "A smon ver se ël test fornì a l'é veuid.",
-	"TEXT_INDEXOF_TOOLTIP": "A smon l'ìndes dla prima/ùltima ocorensa dël prim test ant ël second test. A smon 0 se ël test a l'é nen trovà.",
+	"TEXT_INDEXOF_TOOLTIP": "A smon l'ìndes dla prima/ùltima ocorensa dël prim test ant ël second test. A smon %1 se ël test a l'é nen trovà.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "ant ël test",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "trové la prima ocorensa dël test",
 	"TEXT_INDEXOF_OPERATOR_LAST": "trové l'ùltima ocorensa dël test",
@@ -226,7 +226,7 @@
 	"LISTS_INLIST": "ant la lista",
 	"LISTS_INDEX_OF_FIRST": "trové la prima ocorensa dl'element",
 	"LISTS_INDEX_OF_LAST": "trové l'ùltima ocorensa dl'element",
-	"LISTS_INDEX_OF_TOOLTIP": "A smon l'ìndes ëd la prima/ùltima ocorensa dl'element ant la lista. A smon 0 se l'element a l'é nen trovà.",
+	"LISTS_INDEX_OF_TOOLTIP": "A smon l'ìndes ëd la prima/ùltima ocorensa dl'element ant la lista. A smon %1 se l'element a l'é nen trovà.",
 	"LISTS_GET_INDEX_GET": "oten-e",
 	"LISTS_GET_INDEX_GET_REMOVE": "oten-e e eliminé",
 	"LISTS_GET_INDEX_REMOVE": "eliminé",
diff --git a/msg/json/pt-br.json b/msg/json/pt-br.json
index 489f5c78c..e76d55be9 100644
--- a/msg/json/pt-br.json
+++ b/msg/json/pt-br.json
@@ -189,7 +189,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Retorna o número de letras (incluindo espaços) no texto fornecido.",
 	"TEXT_ISEMPTY_TITLE": "%1 é vazio",
 	"TEXT_ISEMPTY_TOOLTIP": "Retorna verdadeiro se o texto fornecido for vazio.",
-	"TEXT_INDEXOF_TOOLTIP": "Retorna a posição da primeira/última ocorrência do primeiro texto no segundo texto.  Retorna 0 se o texto não for encontrado.",
+	"TEXT_INDEXOF_TOOLTIP": "Retorna a posição da primeira/última ocorrência do primeiro texto no segundo texto.  Retorna %1 se o texto não for encontrado.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "no texto",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "encontre a primeira ocorrência do item",
 	"TEXT_INDEXOF_OPERATOR_LAST": "encontre a última ocorrência do texto",
@@ -238,7 +238,7 @@
 	"LISTS_INLIST": "na lista",
 	"LISTS_INDEX_OF_FIRST": "encontre a primeira ocorrência do item",
 	"LISTS_INDEX_OF_LAST": "encontre a última ocorrência do item",
-	"LISTS_INDEX_OF_TOOLTIP": "Retorna o índice da primeira/última ocorrência do item na lista.  Retorna 0 se o item não for encontrado.",
+	"LISTS_INDEX_OF_TOOLTIP": "Retorna o índice da primeira/última ocorrência do item na lista.  Retorna %1 se o item não for encontrado.",
 	"LISTS_GET_INDEX_GET": "obter",
 	"LISTS_GET_INDEX_GET_REMOVE": "obter e remover",
 	"LISTS_GET_INDEX_REMOVE": "remover",
diff --git a/msg/json/pt.json b/msg/json/pt.json
index 797f42e45..011fefd9c 100644
--- a/msg/json/pt.json
+++ b/msg/json/pt.json
@@ -198,7 +198,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Devolve o número de letras (incluindo espaços) do texto fornecido.",
 	"TEXT_ISEMPTY_TITLE": "%1 está vazio",
 	"TEXT_ISEMPTY_TOOLTIP": "Retorna verdadeiro se o texto fornecido estiver vazio.",
-	"TEXT_INDEXOF_TOOLTIP": "Retorna a posição da primeira/última ocorrência do primeiro texto no segundo texto.  Retorna 0 se o texto não for encontrado.",
+	"TEXT_INDEXOF_TOOLTIP": "Retorna a posição da primeira/última ocorrência do primeiro texto no segundo texto.  Retorna %1 se o texto não for encontrado.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "no texto",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "primeira ocorrência do texto",
 	"TEXT_INDEXOF_OPERATOR_LAST": "última ocorrência do texto",
@@ -248,7 +248,7 @@
 	"LISTS_INLIST": "na lista",
 	"LISTS_INDEX_OF_FIRST": "encontre a primeira ocorrência do item",
 	"LISTS_INDEX_OF_LAST": "encontre a última ocorrência do item",
-	"LISTS_INDEX_OF_TOOLTIP": "Retorna a posição da primeira/última ocorrência do item na lista.  Retorna 0 se o item não for encontrado.",
+	"LISTS_INDEX_OF_TOOLTIP": "Retorna a posição da primeira/última ocorrência do item na lista.  Retorna %1 se o item não for encontrado.",
 	"LISTS_GET_INDEX_GET": "obter",
 	"LISTS_GET_INDEX_GET_REMOVE": "obter e remover",
 	"LISTS_GET_INDEX_REMOVE": "remover",
diff --git a/msg/json/qqq.json b/msg/json/qqq.json
index 9f990c30b..1aad1ae19 100644
--- a/msg/json/qqq.json
+++ b/msg/json/qqq.json
@@ -209,7 +209,7 @@
 	"TEXT_ISEMPTY_TITLE": "block text - See [https://github.com/google/blockly/wiki/Text#checking-for-empty-text https://github.com/google/blockly/wiki/Text#checking-for-empty-text]. \n\nParameters:\n* %1 - the piece of text to test for emptiness",
 	"TEXT_ISEMPTY_TOOLTIP": "tooltip - See [https://github.com/google/blockly/wiki/Text#checking-for-empty-text https://github.com/google/blockly/wiki/Text#checking-for-empty-text].",
 	"TEXT_INDEXOF_HELPURL": "url - Information about finding a character in a piece of text.",
-	"TEXT_INDEXOF_TOOLTIP": "tooltip - See [https://github.com/google/blockly/wiki/Text#finding-text https://github.com/google/blockly/wiki/Text#finding-text].",
+	"TEXT_INDEXOF_TOOLTIP": "tooltip - %1 will be replaced by either the number 0 or -1 depending on the indexing mode. See [https://github.com/google/blockly/wiki/Text#finding-text https://github.com/google/blockly/wiki/Text#finding-text].",
 	"TEXT_INDEXOF_INPUT_INTEXT": "block text - Title of blocks allowing users to find text.  See [https://github.com/google/blockly/wiki/Text#finding-text https://github.com/google/blockly/wiki/Text#finding-text]. [[File:Blockly-find-text.png]].",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "dropdown - See [https://github.com/google/blockly/wiki/Text#finding-text https://github.com/google/blockly/wiki/Text#finding-text]. [[File:Blockly-find-text.png]].",
 	"TEXT_INDEXOF_OPERATOR_LAST": "dropdown - See [https://github.com/google/blockly/wiki/Text#finding-text https://github.com/google/blockly/wiki/Text#finding-text].  This would replace 'find first occurrence of text' below.  (For more information on how common text is factored out of dropdown menus, see [https://translatewiki.net/wiki/Translating:Blockly#Drop-Down_Menus https://translatewiki.net/wiki/Translating:Blockly#Drop-Down_Menus)].) [[File:Blockly-find-text.png]].",
@@ -273,7 +273,7 @@
 	"LISTS_INDEX_OF_HELPURL": "url - See [https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list].",
 	"LISTS_INDEX_OF_FIRST": "dropdown - See [https://github.com/google/blockly/wiki/Lists#finding-items-in-a-list Lists#finding-items-in-a-list]. [[File:Blockly-list-find.png]]",
 	"LISTS_INDEX_OF_LAST": "dropdown - See [https://github.com/google/blockly/wiki/Lists#finding-items-in-a-list https://github.com/google/blockly/wiki/Lists#finding-items-in-a-list]. [[File:Blockly-list-find.png]]",
-	"LISTS_INDEX_OF_TOOLTIP": "dropdown - See [https://github.com/google/blockly/wiki/Lists#finding-items-in-a-list https://github.com/google/blockly/wiki/Lists#finding-items-in-a-list]. [[File:Blockly-list-find.png]]",
+	"LISTS_INDEX_OF_TOOLTIP": "tooltip - %1 will be replaced by either the number 0 or -1 depending on the indexing mode.  See [https://github.com/google/blockly/wiki/Lists#finding-items-in-a-list https://github.com/google/blockly/wiki/Lists#finding-items-in-a-list]. [[File:Blockly-list-find.png]]",
 	"LISTS_GET_INDEX_GET": "dropdown - Indicates that the user wishes to [https://github.com/google/blockly/wiki/Lists#getting-a-single-item get an item from a list] without removing it from the list.",
 	"LISTS_GET_INDEX_GET_REMOVE": "dropdown - Indicates that the user wishes to [https://github.com/google/blockly/wiki/Lists#getting-a-single-item get and remove an item from a list], as opposed to merely getting it without modifying the list.",
 	"LISTS_GET_INDEX_REMOVE": "dropdown - Indicates that the user wishes to [https://github.com/google/blockly/wiki/Lists#removing-an-item remove an item from a list].\n{{Identical|Remove}}",
diff --git a/msg/json/ro.json b/msg/json/ro.json
index 01365b4e7..a0e0b050b 100644
--- a/msg/json/ro.json
+++ b/msg/json/ro.json
@@ -191,7 +191,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Returnează numărul de litere (inclusiv spaţiile) în textul furnizat.",
 	"TEXT_ISEMPTY_TITLE": "%1 este gol",
 	"TEXT_ISEMPTY_TOOLTIP": "Returnează adevărat dacă textul furnizat este gol.",
-	"TEXT_INDEXOF_TOOLTIP": "Returnează indicele primei/ultimei apariţii din primul text în al doilea text.  Returnează 0 dacă textul nu este găsit.",
+	"TEXT_INDEXOF_TOOLTIP": "Returnează indicele primei/ultimei apariţii din primul text în al doilea text.  Returnează %1 dacă textul nu este găsit.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "în text",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "găseşte prima apariţie a textului",
 	"TEXT_INDEXOF_OPERATOR_LAST": "găseşte ultima apariţie a textului",
@@ -241,7 +241,7 @@
 	"LISTS_INLIST": "în listă",
 	"LISTS_INDEX_OF_FIRST": "Găseşte prima apariţie a elementului",
 	"LISTS_INDEX_OF_LAST": "găseşte ultima apariţie a elementului",
-	"LISTS_INDEX_OF_TOOLTIP": "Revine la indexul de la prima/ultima apariție a elementului din listă. Returnează 0 dacă elementul nu este găsit.",
+	"LISTS_INDEX_OF_TOOLTIP": "Revine la indexul de la prima/ultima apariție a elementului din listă. Returnează %1 dacă elementul nu este găsit.",
 	"LISTS_GET_INDEX_GET": "obţine",
 	"LISTS_GET_INDEX_GET_REMOVE": "obţine şi elimină",
 	"LISTS_GET_INDEX_REMOVE": "elimină",
diff --git a/msg/json/ru.json b/msg/json/ru.json
index d2a5e34c7..67f475142 100644
--- a/msg/json/ru.json
+++ b/msg/json/ru.json
@@ -182,7 +182,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Возвращает число символов (включая пробелы) в заданном тексте.",
 	"TEXT_ISEMPTY_TITLE": "%1 пуст",
 	"TEXT_ISEMPTY_TOOLTIP": "Возвращает значение истина, если предоставленный текст пуст.",
-	"TEXT_INDEXOF_TOOLTIP": "Возвращает номер позиции первого/последнего вхождения первого текста во  втором.  Возвращает 0, если текст не найден.",
+	"TEXT_INDEXOF_TOOLTIP": "Возвращает номер позиции первого/последнего вхождения первого текста во  втором.  Возвращает %1, если текст не найден.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "в тексте",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "найти первое вхождение текста",
 	"TEXT_INDEXOF_OPERATOR_LAST": "найти последнее вхождение текста",
@@ -232,7 +232,7 @@
 	"LISTS_INLIST": "в списке",
 	"LISTS_INDEX_OF_FIRST": "найти первое вхождение элемента",
 	"LISTS_INDEX_OF_LAST": "найти последнее вхождение элемента",
-	"LISTS_INDEX_OF_TOOLTIP": "Возвращает номер позиции первого/последнего вхождения элемента в списке. Возвращает 0, если элемент не найден.",
+	"LISTS_INDEX_OF_TOOLTIP": "Возвращает номер позиции первого/последнего вхождения элемента в списке. Возвращает %1, если элемент не найден.",
 	"LISTS_GET_INDEX_GET": "взять",
 	"LISTS_GET_INDEX_GET_REMOVE": "взять и удалить",
 	"LISTS_GET_INDEX_REMOVE": "удалить",
diff --git a/msg/json/sc.json b/msg/json/sc.json
index 191118662..d64cedaf9 100644
--- a/msg/json/sc.json
+++ b/msg/json/sc.json
@@ -176,7 +176,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Torrat su numeru de lìteras (cun is spàtzius) in su testu giau.",
 	"TEXT_ISEMPTY_TITLE": "%1 est buidu",
 	"TEXT_ISEMPTY_TOOLTIP": "Torrat berus si su testu giau est buidu.",
-	"TEXT_INDEXOF_TOOLTIP": "Torrat s'indixi de sa primu/urtima ocasioni de su primu testu in su segundu testu. Torrat 0 si su testu no ddu agatat.",
+	"TEXT_INDEXOF_TOOLTIP": "Torrat s'indixi de sa primu/urtima ocasioni de su primu testu in su segundu testu. Torrat %1 si su testu no ddu agatat.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "in su testu",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "circa prima ocasioni de su testu",
 	"TEXT_INDEXOF_OPERATOR_LAST": "circa urtima ocasioni de su testu",
@@ -225,7 +225,7 @@
 	"LISTS_INLIST": "in lista",
 	"LISTS_INDEX_OF_FIRST": "circa prima ocasioni de s'item",
 	"LISTS_INDEX_OF_LAST": "circa urtima ocasioni de s'item",
-	"LISTS_INDEX_OF_TOOLTIP": "Torrat s'indixi de sa primu/urtima ocasioni de s'item in sa lista. Torrat 0 si s'item non s'agatat.",
+	"LISTS_INDEX_OF_TOOLTIP": "Torrat s'indixi de sa primu/urtima ocasioni de s'item in sa lista. Torrat %1 si s'item non s'agatat.",
 	"LISTS_GET_INDEX_GET": "piga",
 	"LISTS_GET_INDEX_GET_REMOVE": "piga e fùlia",
 	"LISTS_GET_INDEX_REMOVE": "fùlia",
diff --git a/msg/json/sk.json b/msg/json/sk.json
index 06e7a8e0e..0a2d61ea0 100644
--- a/msg/json/sk.json
+++ b/msg/json/sk.json
@@ -179,7 +179,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Vráti počet písmen (s medzerami) v zadanom texte.",
 	"TEXT_ISEMPTY_TITLE": "%1 je prázdny",
 	"TEXT_ISEMPTY_TOOLTIP": "Vráti hodnotu pravda, ak zadaný text je prázdny.",
-	"TEXT_INDEXOF_TOOLTIP": "Vráti index prvého/posledného výskytu prvého textu v druhom texte. Ak nenájde, vráti 0.",
+	"TEXT_INDEXOF_TOOLTIP": "Vráti index prvého/posledného výskytu prvého textu v druhom texte. Ak nenájde, vráti %1.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "v texte",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "nájdi prvý výskyt textu",
 	"TEXT_INDEXOF_OPERATOR_LAST": "nájdi posledný výskyt textu",
@@ -229,7 +229,7 @@
 	"LISTS_INLIST": "v zozname",
 	"LISTS_INDEX_OF_FIRST": "nájdi prvý výskyt prvku",
 	"LISTS_INDEX_OF_LAST": "nájdi posledný výskyt prvku",
-	"LISTS_INDEX_OF_TOOLTIP": "Vráti index prvého/posledného výskytu prvku v zozname. Ak sa nič nenašlo, vráti 0.",
+	"LISTS_INDEX_OF_TOOLTIP": "Vráti index prvého/posledného výskytu prvku v zozname. Ak sa nič nenašlo, vráti %1.",
 	"LISTS_GET_INDEX_GET": "zisti",
 	"LISTS_GET_INDEX_GET_REMOVE": "zisti a odstráň",
 	"LISTS_GET_INDEX_REMOVE": "odstráň",
diff --git a/msg/json/sl.json b/msg/json/sl.json
index 292adb0d9..c9b0f1985 100644
--- a/msg/json/sl.json
+++ b/msg/json/sl.json
@@ -207,7 +207,7 @@
 	"TEXT_ISEMPTY_TITLE": "%1 je prazno",
 	"TEXT_ISEMPTY_TOOLTIP": "Vrne resnično, če je določeno besedilo prazno.",
 	"TEXT_INDEXOF_HELPURL": "https://github.com/google/blockly/wiki/Text#finding-text",
-	"TEXT_INDEXOF_TOOLTIP": "Vrne mesto (indeks) prve/zadnje pojavitve drugega besedila v prvem besedilu. Če besedila ne najde, vrne 0.",
+	"TEXT_INDEXOF_TOOLTIP": "Vrne mesto (indeks) prve/zadnje pojavitve drugega besedila v prvem besedilu. Če besedila ne najde, vrne %1.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "v besedilu",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "najdi prvo pojavitev besedila",
 	"TEXT_INDEXOF_OPERATOR_LAST": "najdi zadnjo pojavitev besedila",
@@ -268,7 +268,7 @@
 	"LISTS_INDEX_OF_HELPURL": "https://github.com/google/blockly/wiki/Lists#getting-items-from-a-list",
 	"LISTS_INDEX_OF_FIRST": "najdi prvo pojavitev elementa",
 	"LISTS_INDEX_OF_LAST": "najdi zadnjo pojavitev elementa",
-	"LISTS_INDEX_OF_TOOLTIP": "Vrne mesto (indeks) prve/zadnje pojavitve elementa v seznamu. Če elementa ne najde, vrne 0.",
+	"LISTS_INDEX_OF_TOOLTIP": "Vrne mesto (indeks) prve/zadnje pojavitve elementa v seznamu. Če elementa ne najde, vrne %1.",
 	"LISTS_GET_INDEX_GET": "vrni",
 	"LISTS_GET_INDEX_GET_REMOVE": "odstrani in vrni",
 	"LISTS_GET_INDEX_REMOVE": "odstrani",
diff --git a/msg/json/sq.json b/msg/json/sq.json
index 74b05558e..7a649dcad 100644
--- a/msg/json/sq.json
+++ b/msg/json/sq.json
@@ -186,7 +186,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Pergjigjet me nje numer shkronjash (duke perfshire hapesire) ne tekstin e dhene.",
 	"TEXT_ISEMPTY_TITLE": "%1 eshte bosh",
 	"TEXT_ISEMPTY_TOOLTIP": "Kthehet e vertete neqoftese teksti i dhene eshte bosh.",
-	"TEXT_INDEXOF_TOOLTIP": "Pergjigjet me indeksin e pare/fundit te rastisjes se tekstit te pare ne tekstin e dyte. Pergjigjet me 0 ne qofte se teksti nuk u gjet.",
+	"TEXT_INDEXOF_TOOLTIP": "Pergjigjet me indeksin e pare/fundit te rastisjes se tekstit te pare ne tekstin e dyte. Pergjigjet me %1 ne qofte se teksti nuk u gjet.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "ne tekst",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "gjej rastisjen e pare te tekstit",
 	"TEXT_INDEXOF_OPERATOR_LAST": "gjej rastisjen e fundit te tekstit",
@@ -236,7 +236,7 @@
 	"LISTS_INLIST": "në listë",
 	"LISTS_INDEX_OF_FIRST": "gjen ndodhjen e parë të sendit",
 	"LISTS_INDEX_OF_LAST": "gjen ndodhjen e fundit të sendit",
-	"LISTS_INDEX_OF_TOOLTIP": "Kthen indeksin e ndodhjes së parë/fudit të sendit në listë. Kthen 0 nëse teksti nuk është gjetur.",
+	"LISTS_INDEX_OF_TOOLTIP": "Kthen indeksin e ndodhjes së parë/fudit të sendit në listë. Kthen %1 nëse teksti nuk është gjetur.",
 	"LISTS_GET_INDEX_GET": "merr",
 	"LISTS_GET_INDEX_GET_REMOVE": "merr dhe fshij",
 	"LISTS_GET_INDEX_REMOVE": "largo",
diff --git a/msg/json/sr.json b/msg/json/sr.json
index 91fceb823..c3c8f0d79 100644
--- a/msg/json/sr.json
+++ b/msg/json/sr.json
@@ -194,7 +194,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Враћа број слова (уклјучујући размаке) у датом тексту.",
 	"TEXT_ISEMPTY_TITLE": "%1 је празан",
 	"TEXT_ISEMPTY_TOOLTIP": "Враћа тачно ако је доставлјени текст празан.",
-	"TEXT_INDEXOF_TOOLTIP": "Враћа однос првог/заднјег појавлјиванја текста у другом тексту. Врађа 0 ако текст није пронађен.",
+	"TEXT_INDEXOF_TOOLTIP": "Враћа однос првог/заднјег појавлјиванја текста у другом тексту. Врађа %1 ако текст није пронађен.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "у тексту",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "пронађи прво појављивање текста",
 	"TEXT_INDEXOF_OPERATOR_LAST": "пронађи последње појављивање текста",
@@ -247,7 +247,7 @@
 	"LISTS_INLIST": "на списку",
 	"LISTS_INDEX_OF_FIRST": "пронађи прво појављивање ставке",
 	"LISTS_INDEX_OF_LAST": "пронађи последње појављивање ставке",
-	"LISTS_INDEX_OF_TOOLTIP": "Враћа број првог и/последњег уласка елемента у листу. Враћа 0 Ако елемент није пронађен.",
+	"LISTS_INDEX_OF_TOOLTIP": "Враћа број првог и/последњег уласка елемента у листу. Враћа %1 Ако елемент није пронађен.",
 	"LISTS_GET_INDEX_GET": "преузми",
 	"LISTS_GET_INDEX_GET_REMOVE": "преузми и уклони",
 	"LISTS_GET_INDEX_REMOVE": "уклони",
diff --git a/msg/json/sv.json b/msg/json/sv.json
index e7e14e2ac..810eb8951 100644
--- a/msg/json/sv.json
+++ b/msg/json/sv.json
@@ -195,7 +195,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Ger tillbaka antalet bokstäver (inklusive mellanslag) i den angivna texten.",
 	"TEXT_ISEMPTY_TITLE": "%1 är tom",
 	"TEXT_ISEMPTY_TOOLTIP": "Returnerar sant om den angivna texten är tom.",
-	"TEXT_INDEXOF_TOOLTIP": "Ger tillbaka indexet för den första/sista förekomsten av första texten i den andra texten.  Ger tillbaka 0 om texten inte hittas.",
+	"TEXT_INDEXOF_TOOLTIP": "Ger tillbaka indexet för den första/sista förekomsten av första texten i den andra texten.  Ger tillbaka %1 om texten inte hittas.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "i texten",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "hitta första förekomsten av texten",
 	"TEXT_INDEXOF_OPERATOR_LAST": "hitta sista förekomsten av texten",
@@ -246,7 +246,7 @@
 	"LISTS_INLIST": "i listan",
 	"LISTS_INDEX_OF_FIRST": "hitta första förekomsten av objektet",
 	"LISTS_INDEX_OF_LAST": "hitta sista förekomsten av objektet",
-	"LISTS_INDEX_OF_TOOLTIP": "Ger tillbaka den första/sista förekomsten av objektet i listan. Ger tillbaka 0 om objektet inte hittas.",
+	"LISTS_INDEX_OF_TOOLTIP": "Ger tillbaka den första/sista förekomsten av objektet i listan. Ger tillbaka %1 om objektet inte hittas.",
 	"LISTS_GET_INDEX_GET": "hämta",
 	"LISTS_GET_INDEX_GET_REMOVE": "hämta och ta bort",
 	"LISTS_GET_INDEX_REMOVE": "ta bort",
diff --git a/msg/json/ta.json b/msg/json/ta.json
index 5c1476753..ec0048a55 100644
--- a/msg/json/ta.json
+++ b/msg/json/ta.json
@@ -176,7 +176,6 @@
 	"TEXT_LENGTH_TOOLTIP": "தொடரில் உள்ள எழுத்துக்களின் (இடைவெளிகளையும் சேர்த்து) எண்ணிகையை பின்கொடு.",
 	"TEXT_ISEMPTY_TITLE": "%1 காலியானது",
 	"TEXT_ISEMPTY_TOOLTIP": "காலியானது என்றால் மெய் மதிப்பை பின்கொடு",
-	"TEXT_INDEXOF_TOOLTIP": "இரண்டாவது உரையில் முதல் உரையின் முதல்/கடை இருக்கை குறிஎண்ணை பின்கொடு.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "உரையில்",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "உரையில் முதல் தோற்ற இடத்தை பின்கொடு",
 	"TEXT_INDEXOF_OPERATOR_LAST": "உரையில் கடைசி தோற்ற இடத்தை பின்கொடு",
@@ -225,7 +224,7 @@
 	"LISTS_INLIST": "பட்டியலில் உள்ள",
 	"LISTS_INDEX_OF_FIRST": "உரையில் முதல் தோற்ற இடத்தை காட்டு",
 	"LISTS_INDEX_OF_LAST": "உரையில் கடைசி தோற்ற இடத்தை காட்டு",
-	"LISTS_INDEX_OF_TOOLTIP": "பட்டியலில் மதிப்பின் முதல், கடைசி தோற்ற இடத்தை பின்கொடு. காணாவிட்டால் 0 பின்கொடு.",
+	"LISTS_INDEX_OF_TOOLTIP": "பட்டியலில் மதிப்பின் முதல், கடைசி தோற்ற இடத்தை பின்கொடு. காணாவிட்டால் %1 பின்கொடு.",
 	"LISTS_GET_INDEX_GET": "எடு",
 	"LISTS_GET_INDEX_GET_REMOVE": "பெற்று நீக்குக",
 	"LISTS_GET_INDEX_REMOVE": "நீக்குக",
diff --git a/msg/json/tcy.json b/msg/json/tcy.json
index 74afa6c39..618845ea7 100644
--- a/msg/json/tcy.json
+++ b/msg/json/tcy.json
@@ -175,7 +175,7 @@
 	"TEXT_LENGTH_TOOLTIP": "ಕೊರ್‌ನ ಪಟ್ಯೊದ ಅಕ್ಷರೊಲೆನ(ಅಂತರೊಲು ಸೇರ್‌ನಂಚ) ಸಂಖ್ಯೆನ್ ಪಿರಕೊರು.",
 	"TEXT_ISEMPTY_TITLE": "%1 ಕಾಲಿ",
 	"TEXT_ISEMPTY_TOOLTIP": "ಕೊರ್‌ನ ಪಟ್ಯೊ ಕಾಲಿಂದ್ ಸತ್ಯೊ ಆಂಡ ಪಿರಕೊರು",
-	"TEXT_INDEXOF_TOOLTIP": "ಸುರುತ ಪಟ್ಯೊದ ಸೂಚ್ಯಿ/ಅಕೇರಿಟ್ ಸಂಭವಿಸವುನ ಸುರುತ ಪಟ್ಟಯೊದುಲಯಿದ ರಡ್ಡನೆ ಪಟ್ಯೊನು ಪಿರಕೊರು.  ೦ ಪಟ್ಯೊ ತಿಕಂದಿತ್ತ್‌ಂಡ ಪಿರಕೊರು.",
+	"TEXT_INDEXOF_TOOLTIP": "ಸುರುತ ಪಟ್ಯೊದ ಸೂಚ್ಯಿ/ಅಕೇರಿಟ್ ಸಂಭವಿಸವುನ ಸುರುತ ಪಟ್ಟಯೊದುಲಯಿದ ರಡ್ಡನೆ ಪಟ್ಯೊನು ಪಿರಕೊರು.  %1 ಪಟ್ಯೊ ತಿಕಂದಿತ್ತ್‌ಂಡ ಪಿರಕೊರು.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "ಪಟ್ಯೊಡು",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "ಸುರುಟು ಸಂಭವಿಸಯಿನ ಪಟ್ಯೊನು ನಾಡ್‍ಲ",
 	"TEXT_INDEXOF_OPERATOR_LAST": "ದುಂಬು ಕರಿನ ಪಟ್ಯೊನು ನಾಡ್‍ಲೆ",
@@ -224,7 +224,7 @@
 	"LISTS_INLIST": "ಪಟ್ಟಿಡ್",
 	"LISTS_INDEX_OF_FIRST": "ದುಂಬು ಕರಿನ ಪಟ್ಯೊನು ನಾಡ್‍ಲೆ",
 	"LISTS_INDEX_OF_LAST": "ಅಕೆರಿಗ್ ಕರಿನ ಪಟ್ಯೊನು ನಾಡ್‍ಲೆ",
-	"LISTS_INDEX_OF_TOOLTIP": "ಸುರುತ ಪಟ್ಯೊದ ಸೂಚ್ಯಿ/ಅಕೇರಿಟ್ ಸಂಭವಿಸವುನ ಸುರುತ ಪಟ್ಟಯೊದುಲಯಿದ ರಡ್ಡನೆ ಪಟ್ಯೊನು ಪಿರಕೊರು.  ೦ ಪಟ್ಯೊ ತಿಕಂದಿತ್ತ್‌ಂಡ ಪಿರಕೊರು.",
+	"LISTS_INDEX_OF_TOOLTIP": "ಸುರುತ ಪಟ್ಯೊದ ಸೂಚ್ಯಿ/ಅಕೇರಿಟ್ ಸಂಭವಿಸವುನ ಸುರುತ ಪಟ್ಟಯೊದುಲಯಿದ ರಡ್ಡನೆ ಪಟ್ಯೊನು ಪಿರಕೊರು.  %1 ಪಟ್ಯೊ ತಿಕಂದಿತ್ತ್‌ಂಡ ಪಿರಕೊರು.",
 	"LISTS_GET_INDEX_GET": "ದೆತೊನು",
 	"LISTS_GET_INDEX_GET_REMOVE": "ದೆತೊನಿಯರ ಬುಕ್ಕೊ ದೆಪ್ಪೆರೆ",
 	"LISTS_GET_INDEX_REMOVE": "ದೆಪ್ಪುಲೆ",
diff --git a/msg/json/th.json b/msg/json/th.json
index d2ee19352..8aea2db61 100644
--- a/msg/json/th.json
+++ b/msg/json/th.json
@@ -175,7 +175,7 @@
 	"TEXT_LENGTH_TOOLTIP": "คืนค่าความยาวของข้อความ (รวมช่องว่าง)",
 	"TEXT_ISEMPTY_TITLE": "%1 ว่าง",
 	"TEXT_ISEMPTY_TOOLTIP": "คืนค่าจริง ถ้าข้อความยังว่าง",
-	"TEXT_INDEXOF_TOOLTIP": "คืนค่าตำแหน่งที่พบข้อความแรกอยู่ในข้อความที่สอง คืนค่า 0 ถ้าหาไม่พบ",
+	"TEXT_INDEXOF_TOOLTIP": "คืนค่าตำแหน่งที่พบข้อความแรกอยู่ในข้อความที่สอง คืนค่า %1 ถ้าหาไม่พบ",
 	"TEXT_INDEXOF_INPUT_INTEXT": "ในข้อความ",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "หาข้อความแรกที่พบ",
 	"TEXT_INDEXOF_OPERATOR_LAST": "หาข้อความสุดท้ายที่พบ",
@@ -224,7 +224,7 @@
 	"LISTS_INLIST": "ในรายการ",
 	"LISTS_INDEX_OF_FIRST": "หาอันแรกที่พบ",
 	"LISTS_INDEX_OF_LAST": "หาอันสุดท้ายที่พบ",
-	"LISTS_INDEX_OF_TOOLTIP": "คืนค่าตำแหน่งของไอเท็มอันแรก/สุดท้ายที่พบในรายการ คืนค่า 0 ถ้าหาไม่พบ",
+	"LISTS_INDEX_OF_TOOLTIP": "คืนค่าตำแหน่งของไอเท็มอันแรก/สุดท้ายที่พบในรายการ คืนค่า %1 ถ้าหาไม่พบ",
 	"LISTS_GET_INDEX_GET": "เรียกดู",
 	"LISTS_GET_INDEX_GET_REMOVE": "เรียกดูและเอาออก",
 	"LISTS_GET_INDEX_REMOVE": "เอาออก",
diff --git a/msg/json/tl.json b/msg/json/tl.json
index 5c1233b99..a4cb69db1 100644
--- a/msg/json/tl.json
+++ b/msg/json/tl.json
@@ -186,7 +186,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Returns the number of letters (including spaces) in the provided text.",
 	"TEXT_ISEMPTY_TITLE": "%1 is empty",
 	"TEXT_ISEMPTY_TOOLTIP": "Returns true if the provided text is empty.",
-	"TEXT_INDEXOF_TOOLTIP": "Returns the index of the first/last occurrence of first text in the second text.  Returns 0 if text is not found.",
+	"TEXT_INDEXOF_TOOLTIP": "Returns the index of the first/last occurrence of first text in the second text.  Returns %1 if text is not found.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "in text",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "find first occurrence of text",
 	"TEXT_INDEXOF_OPERATOR_LAST": "find last occurrence of text",
@@ -236,7 +236,7 @@
 	"LISTS_INLIST": "sa list",
 	"LISTS_INDEX_OF_FIRST": "Hanapin ang unang pangyayari ng item",
 	"LISTS_INDEX_OF_LAST": "hanapin ang huling pangyayari ng item",
-	"LISTS_INDEX_OF_TOOLTIP": "Pagbalik ng index ng una/huli pangyayari ng item sa list. Pagbalik ng 0 kung ang item ay hindi makita.",
+	"LISTS_INDEX_OF_TOOLTIP": "Pagbalik ng index ng una/huli pangyayari ng item sa list. Pagbalik ng %1 kung ang item ay hindi makita.",
 	"LISTS_GET_INDEX_GET": "kunin",
 	"LISTS_GET_INDEX_GET_REMOVE": "kunin at tanggalin",
 	"LISTS_GET_INDEX_REMOVE": "tanggalin",
diff --git a/msg/json/tr.json b/msg/json/tr.json
index 3ce5aa485..bbd8c955e 100644
--- a/msg/json/tr.json
+++ b/msg/json/tr.json
@@ -203,7 +203,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Yazı içerisinde verilen harflerin ( harf arasındaki boşluklar dahil) sayısını verir .",
 	"TEXT_ISEMPTY_TITLE": "%1 boş",
 	"TEXT_ISEMPTY_TOOLTIP": "Verilen metin boşsa true(doğru) değerini verir.",
-	"TEXT_INDEXOF_TOOLTIP": "İlk metnin ikinci metnin içindeki ilk ve son varoluşlarının indeksini döndürür.Metin bulunamadıysa 0 döndürür.",
+	"TEXT_INDEXOF_TOOLTIP": "İlk metnin ikinci metnin içindeki ilk ve son varoluşlarının indeksini döndürür.Metin bulunamadıysa %1 döndürür.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "metinde",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "Metnin ilk varolduğu yeri bul",
 	"TEXT_INDEXOF_OPERATOR_LAST": "Metnin son varolduğu yeri bul",
@@ -256,7 +256,7 @@
 	"LISTS_INLIST": "Listede",
 	"LISTS_INDEX_OF_FIRST": "Öğenin ilk varolduğu yeri bul",
 	"LISTS_INDEX_OF_LAST": "Öğenin son varolduğu yeri bul",
-	"LISTS_INDEX_OF_TOOLTIP": "Listedeki öğenin ilk/son oluşumunun indeksini döndürür. Eğer öğe bulunamaz ise 0 döndürür.",
+	"LISTS_INDEX_OF_TOOLTIP": "Listedeki öğenin ilk/son oluşumunun indeksini döndürür. Eğer öğe bulunamaz ise %1 döndürür.",
 	"LISTS_GET_INDEX_GET": "Al",
 	"LISTS_GET_INDEX_GET_REMOVE": "al ve kaldır",
 	"LISTS_GET_INDEX_REMOVE": "kaldır",
diff --git a/msg/json/uk.json b/msg/json/uk.json
index fc25fc5b8..66fcdabfe 100644
--- a/msg/json/uk.json
+++ b/msg/json/uk.json
@@ -187,7 +187,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Повертає число символів (включно з пропусками) у даному тексті.",
 	"TEXT_ISEMPTY_TITLE": "%1 є порожнім",
 	"TEXT_ISEMPTY_TOOLTIP": "Повертає істину, якщо вказаний текст порожній.",
-	"TEXT_INDEXOF_TOOLTIP": "Повертає індекс першого/останнього входження першого тексту в другий. Повертає 0, якщо текст не знайдено.",
+	"TEXT_INDEXOF_TOOLTIP": "Повертає індекс першого/останнього входження першого тексту в другий. Повертає %1, якщо текст не знайдено.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "у тексті",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "знайти перше входження тексту",
 	"TEXT_INDEXOF_OPERATOR_LAST": "знайти останнє входження тексту",
@@ -241,7 +241,7 @@
 	"LISTS_INLIST": "у списку",
 	"LISTS_INDEX_OF_FIRST": "знайти перше входження елемента",
 	"LISTS_INDEX_OF_LAST": "знайти останнє входження елемента",
-	"LISTS_INDEX_OF_TOOLTIP": "Повертає індекс першого/останнього входження елемента у списку. Повертає 0, якщо елемент не знайдено.",
+	"LISTS_INDEX_OF_TOOLTIP": "Повертає індекс першого/останнього входження елемента у списку. Повертає %1, якщо елемент не знайдено.",
 	"LISTS_GET_INDEX_GET": "отримати",
 	"LISTS_GET_INDEX_GET_REMOVE": "отримати і вилучити",
 	"LISTS_GET_INDEX_REMOVE": "вилучити",
diff --git a/msg/json/vi.json b/msg/json/vi.json
index 4c801fff2..5f26b007d 100644
--- a/msg/json/vi.json
+++ b/msg/json/vi.json
@@ -178,7 +178,7 @@
 	"TEXT_LENGTH_TOOLTIP": "Hoàn trả số lượng ký tự (kể cả khoảng trắng) trong văn bản đầu vào.",
 	"TEXT_ISEMPTY_TITLE": "%1 trống không",
 	"TEXT_ISEMPTY_TOOLTIP": "Hoàn trả “đúng nếu văn bản không có ký tự nào.",
-	"TEXT_INDEXOF_TOOLTIP": "Hoàn trả vị trí xuất hiện đầu/cuối của văn bản thứ nhất trong văn bản thứ hai.  Nếu không tìm thấy thì hoàn trả số 0.",
+	"TEXT_INDEXOF_TOOLTIP": "Hoàn trả vị trí xuất hiện đầu/cuối của văn bản thứ nhất trong văn bản thứ hai.  Nếu không tìm thấy thì hoàn trả số %1.",
 	"TEXT_INDEXOF_INPUT_INTEXT": "trong văn bản",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "tìm sự có mặt đầu tiên của",
 	"TEXT_INDEXOF_OPERATOR_LAST": "tìm sự có mặt cuối cùng của",
@@ -229,7 +229,7 @@
 	"LISTS_INLIST": "trong dánh sách",
 	"LISTS_INDEX_OF_FIRST": "tìm sự có mặt đầu tiên của vật",
 	"LISTS_INDEX_OF_LAST": "tìm sự có mặt cuối cùng của vật",
-	"LISTS_INDEX_OF_TOOLTIP": "Hoàn trả vị trí xuất hiện đầu/cuối của vật trong danh sách.  Nếu không tìm thấy thì hoàn trả số 0.",
+	"LISTS_INDEX_OF_TOOLTIP": "Hoàn trả vị trí xuất hiện đầu/cuối của vật trong danh sách.  Nếu không tìm thấy thì hoàn trả số %1.",
 	"LISTS_GET_INDEX_GET": "lấy thành tố",
 	"LISTS_GET_INDEX_GET_REMOVE": "lấy và xóa thành tố",
 	"LISTS_GET_INDEX_REMOVE": "xóa thành tố",
diff --git a/msg/json/zh-hans.json b/msg/json/zh-hans.json
index 670a09d15..f47e3de7e 100644
--- a/msg/json/zh-hans.json
+++ b/msg/json/zh-hans.json
@@ -186,7 +186,7 @@
 	"TEXT_LENGTH_TOOLTIP": "返回提供文本的字母数（包括空格）。",
 	"TEXT_ISEMPTY_TITLE": "%1是空的",
 	"TEXT_ISEMPTY_TOOLTIP": "如果提供的文本为空，则返回真。",
-	"TEXT_INDEXOF_TOOLTIP": "返回在第二个字串中的第一/最后一个匹配项的索引值。如果未找到则返回 0。",
+	"TEXT_INDEXOF_TOOLTIP": "返回在第二个字串中的第一/最后一个匹配项的索引值。如果未找到则返回 %1。",
 	"TEXT_INDEXOF_INPUT_INTEXT": "自文本",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "寻找第一个出现的文本",
 	"TEXT_INDEXOF_OPERATOR_LAST": "寻找最后一个出现的文本",
@@ -240,7 +240,7 @@
 	"LISTS_INLIST": "在列表中",
 	"LISTS_INDEX_OF_FIRST": "找出第一个项出现",
 	"LISTS_INDEX_OF_LAST": "找出最后一个项出现",
-	"LISTS_INDEX_OF_TOOLTIP": "返回在列表中的第一/最后一个匹配项的索引值。如果找不到项目则返回0。",
+	"LISTS_INDEX_OF_TOOLTIP": "返回在列表中的第一/最后一个匹配项的索引值。如果找不到项目则返回%1。",
 	"LISTS_GET_INDEX_GET": "获得",
 	"LISTS_GET_INDEX_GET_REMOVE": "取出并移除",
 	"LISTS_GET_INDEX_REMOVE": "移除",
diff --git a/msg/json/zh-hant.json b/msg/json/zh-hant.json
index bcd166754..0224f756b 100644
--- a/msg/json/zh-hant.json
+++ b/msg/json/zh-hant.json
@@ -183,7 +183,7 @@
 	"TEXT_LENGTH_TOOLTIP": "返回這串文字的字元數（含空格） 。",
 	"TEXT_ISEMPTY_TITLE": "%1 為空",
 	"TEXT_ISEMPTY_TOOLTIP": "如果提供的字串為空，則返回 真。",
-	"TEXT_INDEXOF_TOOLTIP": "返回在第二個字串中的第一個/最後一個匹配項目的索引值。如果未找到則返回 0。",
+	"TEXT_INDEXOF_TOOLTIP": "返回在第二個字串中的第一個/最後一個匹配項目的索引值。如果未找到則返回 %1。",
 	"TEXT_INDEXOF_INPUT_INTEXT": "在字串",
 	"TEXT_INDEXOF_OPERATOR_FIRST": "尋找 第一個 出現的字串",
 	"TEXT_INDEXOF_OPERATOR_LAST": "尋找 最後一個 出現的字串",
@@ -233,7 +233,7 @@
 	"LISTS_INLIST": "自列表",
 	"LISTS_INDEX_OF_FIRST": "找出 第一個 項目出現",
 	"LISTS_INDEX_OF_LAST": "找出 最後一個 項目出現",
-	"LISTS_INDEX_OF_TOOLTIP": "返回在列表中的第一個/最後一個匹配項目的索引值。如果未找到則返回 0。",
+	"LISTS_INDEX_OF_TOOLTIP": "返回在列表中的第一個/最後一個匹配項目的索引值。如果未找到則返回 %1。",
 	"LISTS_GET_INDEX_GET": "取值",
 	"LISTS_GET_INDEX_GET_REMOVE": "取出並移除",
 	"LISTS_GET_INDEX_REMOVE": "移除",
diff --git a/msg/messages.js b/msg/messages.js
index 691e2ce94..740a34d8d 100644
--- a/msg/messages.js
+++ b/msg/messages.js
@@ -539,8 +539,8 @@ Blockly.Msg.TEXT_ISEMPTY_TOOLTIP = 'Returns true if the provided text is empty.'
 
 /// url - Information about finding a character in a piece of text.
 Blockly.Msg.TEXT_INDEXOF_HELPURL = 'https://github.com/google/blockly/wiki/Text#finding-text';
-/// tooltip - See [https://github.com/google/blockly/wiki/Text#finding-text https://github.com/google/blockly/wiki/Text#finding-text].
-Blockly.Msg.TEXT_INDEXOF_TOOLTIP = 'Returns the index of the first/last occurrence of the first text in the second text. Returns 0 if text is not found.';
+/// tooltip - %1 will be replaced by either the number 0 or -1 depending on the indexing mode. See [https://github.com/google/blockly/wiki/Text#finding-text https://github.com/google/blockly/wiki/Text#finding-text].
+Blockly.Msg.TEXT_INDEXOF_TOOLTIP = 'Returns the index of the first/last occurrence of the first text in the second text. Returns %1 if text is not found.';
 /// block text - Title of blocks allowing users to find text.  See
 /// [https://github.com/google/blockly/wiki/Text#finding-text
 /// https://github.com/google/blockly/wiki/Text#finding-text].
@@ -801,10 +801,10 @@ Blockly.Msg.LISTS_INDEX_OF_FIRST = 'find first occurrence of item';
 /// https://github.com/google/blockly/wiki/Lists#finding-items-in-a-list].
 /// [[File:Blockly-list-find.png]]
 Blockly.Msg.LISTS_INDEX_OF_LAST = 'find last occurrence of item';
-/// dropdown - See [https://github.com/google/blockly/wiki/Lists#finding-items-in-a-list
+/// tooltip - %1 will be replaced by either the number 0 or -1 depending on the indexing mode.  See [https://github.com/google/blockly/wiki/Lists#finding-items-in-a-list
 /// https://github.com/google/blockly/wiki/Lists#finding-items-in-a-list].
 /// [[File:Blockly-list-find.png]]
-Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = 'Returns the index of the first/last occurrence of the item in the list. Returns 0 if item is not found.';
+Blockly.Msg.LISTS_INDEX_OF_TOOLTIP = 'Returns the index of the first/last occurrence of the item in the list. Returns %1 if item is not found.';
 
 Blockly.Msg.LISTS_GET_INDEX_HELPURL = Blockly.Msg.LISTS_INDEX_OF_HELPURL;
 /// dropdown - Indicates that the user wishes to