diff --git a/msg/json/cdo.json b/msg/json/cdo.json
deleted file mode 100644
index cec92b8ba..000000000
--- a/msg/json/cdo.json
+++ /dev/null
@@ -1,6 +0,0 @@
-{
-	"@metadata": {
-		"authors": []
-	},
-	"DIALOG_OK": "確定"
-}
diff --git a/msg/json/el.json b/msg/json/el.json
index fe2389196..ffbe94f4d 100644
--- a/msg/json/el.json
+++ b/msg/json/el.json
@@ -39,6 +39,7 @@
 	"DELETE_X_BLOCKS": "Διαγραφή %1 μπλοκ",
 	"DELETE_ALL_BLOCKS": "Να διαγραφούν όλα τα %1 μπλοκ;",
 	"CLEAN_UP": "Εκκαθάριση μπλοκ",
+	"CLOSE": "Κλείσιμο",
 	"COLLAPSE_BLOCK": "Σύμπτυξη μπλοκ",
 	"COLLAPSE_ALL": "Σύμπτυξη μπλοκ",
 	"EXPAND_BLOCK": "Ανάπτυξη μπλοκ",
@@ -352,5 +353,15 @@
 	"WORKSPACE_ARIA_LABEL": "Χώρος εργασίας Blockly",
 	"COLLAPSED_WARNINGS_WARNING": "Υπάρχουν προειδοποιήσεις στα συμπτυγμένα μπλοκ.",
 	"DIALOG_OK": "Εντάξει",
-	"DIALOG_CANCEL": "Ακύρωση"
+	"DIALOG_CANCEL": "Ακύρωση",
+	"DELETE_KEY": "Διαγραφή",
+	"WINDOWS": "Windows",
+	"MAC_OS": "macOS",
+	"CHROME_OS": "ChromeOS",
+	"LINUX": "Linux",
+	"CONTROL_KEY": "Ctrl",
+	"ALT_KEY": "Alt",
+	"CUT_SHORTCUT": "Αποκοπή (%1)",
+	"COPY_SHORTCUT": "Αντιγραφή (%1)",
+	"PASTE_SHORTCUT": "Επικόλληση (%1)"
 }
diff --git a/msg/json/gl.json b/msg/json/gl.json
index 62f4192c3..7ff994277 100644
--- a/msg/json/gl.json
+++ b/msg/json/gl.json
@@ -22,6 +22,7 @@
 	"DELETE_X_BLOCKS": "Borrar %1 bloques",
 	"DELETE_ALL_BLOCKS": "Queres eliminar os %1 bloques?",
 	"CLEAN_UP": "Limpar os bloques",
+	"CLOSE": "Pechar",
 	"COLLAPSE_BLOCK": "Contraer o bloque",
 	"COLLAPSE_ALL": "Contraer os bloques",
 	"EXPAND_BLOCK": "Expandir o bloque",
@@ -334,5 +335,37 @@
 	"WORKSPACE_ARIA_LABEL": "Espazo de traballo do Blockly",
 	"COLLAPSED_WARNINGS_WARNING": "Os bloques contraídos conteñen avisos.",
 	"DIALOG_OK": "Aceptar",
-	"DIALOG_CANCEL": "Cancelar"
+	"DIALOG_CANCEL": "Cancelar",
+	"DELETE_SHORTCUT": "Eliminar o bloque (%1)",
+	"DELETE_KEY": "Supr",
+	"EDIT_BLOCK_CONTENTS": "Editar o contido do bloque (%1)",
+	"INSERT_BLOCK": "Inserir o bloque (%1)",
+	"START_MOVE": "Comezar o movemento",
+	"FINISH_MOVE": "Finalizar o movemento",
+	"ABORT_MOVE": "Cancelar o movemento",
+	"MOVE_LEFT_CONSTRAINED": "Mover á esquerda, restrinxido",
+	"MOVE_RIGHT_CONSTRAINED": "Mover á dereita, restrinxido",
+	"MOVE_UP_CONSTRAINED": "Mover cara a arriba, restrinxido",
+	"MOVE_DOWN_CONSTRAINED": "Mover cara a abaixo, restrinxido",
+	"MOVE_LEFT_UNCONSTRAINED": "Mover á esquerda, sen restrición",
+	"MOVE_RIGHT_UNCONSTRAINED": "Mover á dereita, sen restrición",
+	"MOVE_UP_UNCONSTRAINED": "Mover cara a arriba, sen restrición",
+	"MOVE_DOWN_UNCONSTRAINED": "Mover cara a abaixo, sen restrición",
+	"MOVE_BLOCK": "Mover o bloque (%1)",
+	"WINDOWS": "Windows",
+	"MAC_OS": "macOS",
+	"CHROME_OS": "ChromeOS",
+	"LINUX": "Linux",
+	"UNKNOWN": "Descoñecido",
+	"CONTROL_KEY": "Ctrl",
+	"COMMAND_KEY": "⌘ Comando",
+	"OPTION_KEY": "⌥ Opción",
+	"ALT_KEY": "Alt",
+	"CUT_SHORTCUT": "Cortar (%1)",
+	"COPY_SHORTCUT": "Copiar (%1)",
+	"PASTE_SHORTCUT": "Pegar (%1)",
+	"HELP_PROMPT": "Preme %1 para obter axuda cos controis do teclado",
+	"SHORTCUTS_GENERAL": "Xeral",
+	"SHORTCUTS_EDITING": "Edición",
+	"SHORTCUTS_CODE_NAVIGATION": "Navegación de código"
 }
diff --git a/msg/json/it.json b/msg/json/it.json
index e7b658f1f..d25b10ae7 100644
--- a/msg/json/it.json
+++ b/msg/json/it.json
@@ -30,6 +30,7 @@
 	"DELETE_X_BLOCKS": "Cancella %1 blocchi",
 	"DELETE_ALL_BLOCKS": "Cancellare tutti i %1 blocchi?",
 	"CLEAN_UP": "Pulisci i blocchi",
+	"CLOSE": "Chiudi",
 	"COLLAPSE_BLOCK": "Comprimi blocco",
 	"COLLAPSE_ALL": "Comprimi blocchi",
 	"EXPAND_BLOCK": "Espandi blocco",
@@ -342,5 +343,22 @@
 	"WORKSPACE_ARIA_LABEL": "Area di lavoro di Blockly",
 	"COLLAPSED_WARNINGS_WARNING": "I blocchi compressi contengono avvertimenti.",
 	"DIALOG_OK": "OK",
-	"DIALOG_CANCEL": "Annulla"
+	"DIALOG_CANCEL": "Annulla",
+	"DELETE_SHORTCUT": "Cancella blocco (%1)",
+	"DELETE_KEY": "Del",
+	"INSERT_BLOCK": "Inserisci blocco (%1)",
+	"MOVE_BLOCK": "Sposta blocco (%1)",
+	"WINDOWS": "Windows",
+	"MAC_OS": "macOS",
+	"CHROME_OS": "ChromeOS",
+	"LINUX": "Linux",
+	"UNKNOWN": "Sconosciuto",
+	"CONTROL_KEY": "Control",
+	"COMMAND_KEY": "⌘ Command",
+	"OPTION_KEY": "⌥ Option",
+	"ALT_KEY": "Alt",
+	"CUT_SHORTCUT": "Taglia (%1)",
+	"COPY_SHORTCUT": "Copia (%1)",
+	"PASTE_SHORTCUT": "Incolla (%1)",
+	"SHORTCUTS_GENERAL": "Generale"
 }
diff --git a/msg/json/kab.json b/msg/json/kab.json
index cabe44e75..971115fc9 100644
--- a/msg/json/kab.json
+++ b/msg/json/kab.json
@@ -4,6 +4,7 @@
 			"Alem",
 			"Amaziɣ maziɣ",
 			"Belkacem77",
+			"ButterflyOfFire",
 			"K Messaoudi",
 			"SlimaneAmiri",
 			"YubaWissin"
@@ -319,5 +320,12 @@
 	"WORKSPACE_ARIA_LABEL": "Tallunt n umahel Blockly",
 	"COLLAPSED_WARNINGS_WARNING": "Iḥedran yettin gebren ilɣa.",
 	"DIALOG_OK": "IH",
-	"DIALOG_CANCEL": "Sefsex"
+	"DIALOG_CANCEL": "Sefsex",
+	"WINDOWS": "Windows",
+	"MAC_OS": "macOS",
+	"CHROME_OS": "ChromeOS",
+	"LINUX": "Linux",
+	"UNKNOWN": "Arussin",
+	"CONTROL_KEY": "Ctrl",
+	"SHORTCUTS_GENERAL": "Amatu"
 }
diff --git a/msg/json/lb.json b/msg/json/lb.json
index 900ce30a2..9298511df 100644
--- a/msg/json/lb.json
+++ b/msg/json/lb.json
@@ -18,6 +18,7 @@
 	"DELETE_X_BLOCKS": "%1 Bléck läschen",
 	"DELETE_ALL_BLOCKS": "All %1 Bléck läschen?",
 	"CLEAN_UP": "Bléck opraumen",
+	"CLOSE": "Zoumaachen",
 	"COLLAPSE_BLOCK": "Block zesummeklappen",
 	"COLLAPSE_ALL": "Bléck zesummeklappen",
 	"EXPAND_BLOCK": "Block opklappen",
@@ -152,5 +153,12 @@
 	"PROCEDURES_IFRETURN_WARNING": "Opgepasst: Dëse Block däerf nëmmen bannent enger Funktiounsdefitioun benotzt ginn.",
 	"WORKSPACE_COMMENT_DEFAULT_TEXT": "Sot eppes...",
 	"DIALOG_OK": "OK",
-	"DIALOG_CANCEL": "Ofbriechen"
+	"DIALOG_CANCEL": "Ofbriechen",
+	"WINDOWS": "Windows",
+	"MAC_OS": "macOS",
+	"CHROME_OS": "ChromeOS",
+	"LINUX": "Linux",
+	"UNKNOWN": "Onbekannt",
+	"COPY_SHORTCUT": "Kopéieren (%1)",
+	"SHORTCUTS_CODE_NAVIGATION": "Code-Navigatioun"
 }
diff --git a/msg/json/pms.json b/msg/json/pms.json
index 99e92274c..56c2ca894 100644
--- a/msg/json/pms.json
+++ b/msg/json/pms.json
@@ -17,6 +17,7 @@
 	"DELETE_X_BLOCKS": "Scancelé %1 blòch",
 	"DELETE_ALL_BLOCKS": "Scancelé tuti ij %1 blòch?",
 	"CLEAN_UP": "Dëscancelé ij blòch",
+	"CLOSE": "Saré",
 	"COLLAPSE_BLOCK": "Arduve ël blòch",
 	"COLLAPSE_ALL": "Arduve ij blòch",
 	"EXPAND_BLOCK": "Dësvlupé ël blòch",
@@ -321,5 +322,37 @@
 	"WORKSPACE_ARIA_LABEL": "Spassi ëd travaj ëd Blockly",
 	"COLLAPSED_WARNINGS_WARNING": "Ij blòch sarà a conten-o dj'avertense.",
 	"DIALOG_OK": "Va bin",
-	"DIALOG_CANCEL": "Anulé"
+	"DIALOG_CANCEL": "Anulé",
+	"DELETE_SHORTCUT": "Eliminé ël blòch (%1)",
+	"DELETE_KEY": "Elim",
+	"EDIT_BLOCK_CONTENTS": "Modifiché ij contnù d'un blòch (%1)",
+	"INSERT_BLOCK": "Anserì un blòch (%1)",
+	"START_MOVE": "Ancaminé la mòssa",
+	"FINISH_MOVE": "Finì la mòssa",
+	"ABORT_MOVE": "Abortì la mòssa",
+	"MOVE_LEFT_CONSTRAINED": "Bogé a snistra, gropà",
+	"MOVE_RIGHT_CONSTRAINED": "Bogé a drita, gropà",
+	"MOVE_UP_CONSTRAINED": "Bogé an su, gropà",
+	"MOVE_DOWN_CONSTRAINED": "Bogé an giù, gropà",
+	"MOVE_LEFT_UNCONSTRAINED": "Bogé a snistra, nen gropà",
+	"MOVE_RIGHT_UNCONSTRAINED": "Bogé a drita, nen gropà",
+	"MOVE_UP_UNCONSTRAINED": "Bogé an su, nen gropà",
+	"MOVE_DOWN_UNCONSTRAINED": "Bogé an giù, sensa contrente",
+	"MOVE_BLOCK": "Bogé un blòch (%1)",
+	"WINDOWS": "Windows",
+	"MAC_OS": "macOS",
+	"CHROME_OS": "ChromeOS",
+	"LINUX": "Linux",
+	"UNKNOWN": "Nen conossù",
+	"CONTROL_KEY": "Ctrl",
+	"COMMAND_KEY": "⌘ Comand",
+	"OPTION_KEY": "⌥ Opsion",
+	"ALT_KEY": "Alt",
+	"CUT_SHORTCUT": "Tajé (%1)",
+	"COPY_SHORTCUT": "Copié (%1)",
+	"PASTE_SHORTCUT": "Ancolé (%1)",
+	"HELP_PROMPT": "Sgnaché %1 për n'agiut an sij contròj dla tastadura",
+	"SHORTCUTS_GENERAL": "General",
+	"SHORTCUTS_EDITING": "Për modifiché",
+	"SHORTCUTS_CODE_NAVIGATION": "Còde ëd navigassion"
 }
diff --git a/msg/json/qqq.json b/msg/json/qqq.json
index e0310717d..5436da59f 100644
--- a/msg/json/qqq.json
+++ b/msg/json/qqq.json
@@ -25,6 +25,7 @@
 	"DELETE_X_BLOCKS": "context menu - Permanently delete the %1 selected blocks.\n\nParameters:\n* %1 - an integer greater than 1.",
 	"DELETE_ALL_BLOCKS": "confirmation prompt - Question the user if they really wanted to permanently delete all %1 blocks.\n\nParameters:\n* %1 - an integer greater than 1.",
 	"CLEAN_UP": "context menu - Reposition all the blocks so that they form a neat line.",
+	"CLOSE": "toast notification - Accessibility label for close button.",
 	"COLLAPSE_BLOCK": "context menu - Make the appearance of the selected block smaller by hiding some information about it.",
 	"COLLAPSE_ALL": "context menu - Make the appearance of all blocks smaller by hiding some information about it.  Use the same terminology as in the previous message.",
 	"EXPAND_BLOCK": "context menu - Restore the appearance of the selected block by showing information about it that was hidden (collapsed) earlier.",
@@ -403,5 +404,37 @@
 	"WORKSPACE_ARIA_LABEL": "workspace - This text is read out when a user navigates to the workspace while using a screen reader.",
 	"COLLAPSED_WARNINGS_WARNING": "warning - This appears if the user collapses a block, and blocks inside that block have warnings attached to them. It should inform the user that the block they collapsed contains blocks that have warnings.",
 	"DIALOG_OK": "button label - Pressing this button closes help information.\n{{Identical|OK}}",
-	"DIALOG_CANCEL": "button label - Pressing this button cancels a proposed action.\n{{Identical|Cancel}}"
+	"DIALOG_CANCEL": "button label - Pressing this button cancels a proposed action.\n{{Identical|Cancel}}",
+	"DELETE_SHORTCUT": "menu label - Contextual menu item that deletes the focused block.",
+	"DELETE_KEY": "menu label - Keyboard shortcut for the Delete key, shown at the end of a menu item that deletes the focused block.",
+	"EDIT_BLOCK_CONTENTS": "menu label - Contextual menu item that moves the keyboard navigation cursor into a subitem of the focused block.",
+	"INSERT_BLOCK": "menu label - Contextual menu item that prompts the user to choose a block to insert into the program at the focused location.",
+	"START_MOVE": "keyboard shortcut label - Contextual menu item that starts a keyboard-driven move of the focused block.",
+	"FINISH_MOVE": "keyboard shortcut label - Contextual menu item that ends a keyboard-driven move of the focused block.",
+	"ABORT_MOVE": "keyboard shortcut label - Contextual menu item that ends a keyboard-drive move of the focused block by returning it to its original location.",
+	"MOVE_LEFT_CONSTRAINED": "keyboard shortcut label - Description of shortcut that moves a block to the next valid location to the left.",
+	"MOVE_RIGHT_CONSTRAINED": "keyboard shortcut label - Description of shortcut that moves a block to the next valid location to the right.",
+	"MOVE_UP_CONSTRAINED": "keyboard shortcut label - Description of shortcut that moves a block to the next valid location above it.",
+	"MOVE_DOWN_CONSTRAINED": "keyboard shortcut label - Description of shortcut that moves a block to the next valid location below it.",
+	"MOVE_LEFT_UNCONSTRAINED": "keyboard shortcut label - Description of shortcut that moves a block freely to the left.",
+	"MOVE_RIGHT_UNCONSTRAINED": "keyboard shortcut label - Description of shortcut that moves a block freely to the right.",
+	"MOVE_UP_UNCONSTRAINED": "keyboard shortcut label - Description of shortcut that moves a block freely upwards.",
+	"MOVE_DOWN_UNCONSTRAINED": "keyboard shortcut label - Description of shortcut that moves a block freely downwards.",
+	"MOVE_BLOCK": "menu label - Contextual menu item that starts a keyboard-driven block move.",
+	"WINDOWS": "Name of the Microsoft Windows operating system displayed in a list of keyboard shortcuts.",
+	"MAC_OS": "Name of the Apple macOS operating system displayed in a list of keyboard shortcuts,",
+	"CHROME_OS": "Name of the Google ChromeOS operating system displayed in a list of keyboard shortcuts.",
+	"LINUX": "Name of the GNU/Linux operating system displayed in a list of keyboard shortcuts.",
+	"UNKNOWN": "Placeholder name for an operating system that can't be identified in a list of keyboard shortcuts.",
+	"CONTROL_KEY": "Representation of the Control key used in keyboard shortcuts.",
+	"COMMAND_KEY": "Representation of the Mac Command key used in keyboard shortcuts.",
+	"OPTION_KEY": "Representation of the Mac Option key used in keyboard shortcuts.",
+	"ALT_KEY": "Representation of the Alt key used in keyboard shortcuts.",
+	"CUT_SHORTCUT": "menu label - Contextual menu item that cuts the focused item.",
+	"COPY_SHORTCUT": "menu label - Contextual menu item that copies the focused item.",
+	"PASTE_SHORTCUT": "menu label - Contextual menu item that pastes the previously copied item.",
+	"HELP_PROMPT": "Alert message shown to prompt users to review available keyboard shortcuts.",
+	"SHORTCUTS_GENERAL": "shortcut list section header - Label for general purpose keyboard shortcuts.",
+	"SHORTCUTS_EDITING": "shortcut list section header - Label for keyboard shortcuts related to editing a workspace.",
+	"SHORTCUTS_CODE_NAVIGATION": "shortcut list section header - Label for keyboard shortcuts related to moving around the workspace."
 }
diff --git a/msg/json/ru.json b/msg/json/ru.json
index b242563b8..2780c0388 100644
--- a/msg/json/ru.json
+++ b/msg/json/ru.json
@@ -35,6 +35,7 @@
 	"DELETE_X_BLOCKS": "Удалить %1 блоков",
 	"DELETE_ALL_BLOCKS": "Удалить все блоки (%1)?",
 	"CLEAN_UP": "Упорядочить блоки",
+	"CLOSE": "Закрыть",
 	"COLLAPSE_BLOCK": "Свернуть блок",
 	"COLLAPSE_ALL": "Свернуть блоки",
 	"EXPAND_BLOCK": "Развернуть блок",
@@ -359,5 +360,28 @@
 	"WORKSPACE_ARIA_LABEL": "Рабочая область Blockly",
 	"COLLAPSED_WARNINGS_WARNING": "Свёрнутые блоки содержат предупреждения.",
 	"DIALOG_OK": "OK",
-	"DIALOG_CANCEL": "Отмена"
+	"DIALOG_CANCEL": "Отмена",
+	"DELETE_SHORTCUT": "Удалить блок (%1)",
+	"DELETE_KEY": "Del",
+	"EDIT_BLOCK_CONTENTS": "Редактировать содержимое блока (%1)",
+	"INSERT_BLOCK": "Вставить блок (%1)",
+	"START_MOVE": "Начать движение",
+	"FINISH_MOVE": "Завершить движение",
+	"ABORT_MOVE": "Отменить движение",
+	"MOVE_BLOCK": "Переместить блок (%1)",
+	"WINDOWS": "Windows",
+	"MAC_OS": "macOS",
+	"CHROME_OS": "ChromeOS",
+	"LINUX": "Linux",
+	"UNKNOWN": "Неизвестно",
+	"CONTROL_KEY": "Ctrl",
+	"COMMAND_KEY": "⌘ Command",
+	"OPTION_KEY": "⌥ Option",
+	"ALT_KEY": "Alt",
+	"CUT_SHORTCUT": "Вырезать (%1)",
+	"COPY_SHORTCUT": "Копировать (%1)",
+	"PASTE_SHORTCUT": "Вставить (%1)",
+	"HELP_PROMPT": "Нажмите %1 для получения справки по управлению с клавиатуры",
+	"SHORTCUTS_EDITING": "Редактирование",
+	"SHORTCUTS_CODE_NAVIGATION": "Навигация по коду"
 }
diff --git a/msg/json/skr-arab.json b/msg/json/skr-arab.json
index ed1d42c06..cfbc8daa5 100644
--- a/msg/json/skr-arab.json
+++ b/msg/json/skr-arab.json
@@ -17,6 +17,7 @@
 	"DELETE_X_BLOCKS": "%1 بلاکاں کوں مٹاؤ",
 	"DELETE_ALL_BLOCKS": "بھلا %1 بلاکاں کوں مٹاؤں؟",
 	"CLEAN_UP": "بلاک صاف کرو",
+	"CLOSE": "بند کرو",
 	"COLLAPSE_BLOCK": "بلا ک کٹھے کرو",
 	"COLLAPSE_ALL": "بلاک کٹھے کرو",
 	"EXPAND_BLOCK": "بلاک کھنڈاؤ",
@@ -113,5 +114,6 @@
 	"PROCEDURES_DEFRETURN_RETURN": "واپس آ ونڄو",
 	"PROCEDURES_MUTATORARG_TITLE": "ان پُٹ ناں:",
 	"DIALOG_OK": "ٹھیک ہے",
-	"DIALOG_CANCEL": "منسوخ"
+	"DIALOG_CANCEL": "منسوخ",
+	"SHORTCUTS_GENERAL": "عمومی"
 }