bloatpad: replace single quotes with double quotes in menus.ui

Double quotes are more friendly to some l10n tools, and this sets
a good example for application authors to follow.

examples/bp/gtk/menus.ui

@@ -1,91 +1,91 @@
-<?xml version='1.0' encoding='UTF-8'?>
+<?xml version="1.0" encoding="UTF-8"?>
 
 <interface>
-  <menu id='app-menu'>
+  <menu id="app-menu">
     <section>
       <item>
-        <attribute name='label' translatable='yes'>_New Window</attribute>
+        <attribute name="label" translatable="yes">_New Window</attribute>
-        <attribute name='action'>app.new</attribute>
+        <attribute name="action">app.new</attribute>
       </item>
     </section>
     <section>
       <item>
-        <attribute name='label' translatable='yes'>_About Bloatpad</attribute>
+        <attribute name="label" translatable="yes">_About Bloatpad</attribute>
-        <attribute name='hidden-when'>macos-menubar</attribute>
+        <attribute name="hidden-when">macos-menubar</attribute>
-        <attribute name='action'>app.about</attribute>
+        <attribute name="action">app.about</attribute>
       </item>
     </section>
     <section>
       <item>
-        <attribute name='label' translatable='yes'>_Quit</attribute>
+        <attribute name="label" translatable="yes">_Quit</attribute>
-        <attribute name='hidden-when'>macos-menubar</attribute>
+        <attribute name="hidden-when">macos-menubar</attribute>
-        <attribute name='action'>app.quit</attribute>
+        <attribute name="action">app.quit</attribute>
       </item>
     </section>
   </menu>
-  <menu id='menubar'>
+  <menu id="menubar">
     <submenu>
-      <attribute name='label' translatable='yes'>_Edit</attribute>
+      <attribute name="label" translatable="yes">_Edit</attribute>
       <section>
         <item>
-          <attribute name='label' translatable='yes'>_Copy</attribute>
+          <attribute name="label" translatable="yes">_Copy</attribute>
-          <attribute name='action'>win.copy</attribute>
+          <attribute name="action">win.copy</attribute>
         </item>
         <item>
-          <attribute name='label' translatable='yes'>_Paste</attribute>
+          <attribute name="label" translatable="yes">_Paste</attribute>
-          <attribute name='action'>win.paste</attribute>
+          <attribute name="action">win.paste</attribute>
         </item>
       </section>
       <section>
         <item>
           <!-- action should never be missing (so always shown) -->
-          <attribute name='label'>Clear (always shown)</attribute>
+          <attribute name="label">Clear (always shown)</attribute>
-          <attribute name='action'>win.clear</attribute>
+          <attribute name="action">win.clear</attribute>
-          <attribute name='hidden-when'>action-missing</attribute>
+          <attribute name="hidden-when">action-missing</attribute>
         </item>
         <item>
-          <attribute name='label'>Clear (hidden when no text)</attribute>
+          <attribute name="label">Clear (hidden when no text)</attribute>
-          <attribute name='hidden-when'>action-disabled</attribute>
+          <attribute name="hidden-when">action-disabled</attribute>
-          <attribute name='action'>win.clear</attribute>
+          <attribute name="action">win.clear</attribute>
         </item>
         <item>
-          <attribute name='label'>Spell check (does nothing, hides)</attribute>
+          <attribute name="label">Spell check (does nothing, hides)</attribute>
-          <attribute name='hidden-when'>action-missing</attribute>
+          <attribute name="hidden-when">action-missing</attribute>
-          <attribute name='action'>win.spell-check</attribute>
+          <attribute name="action">win.spell-check</attribute>
         </item>
       </section>
       <section>
         <item>
-          <attribute name='label' translatable='yes'>Accelerators...</attribute>
+          <attribute name="label" translatable="yes">Accelerators...</attribute>
-          <attribute name='action'>app.edit-accels</attribute>
+          <attribute name="action">app.edit-accels</attribute>
         </item>
       </section>
       <section>
         <item>
-          <attribute name='label' translatable='yes'>Shortcuts...</attribute>
+          <attribute name="label" translatable="yes">Shortcuts...</attribute>
-          <attribute name='action'>win.show-help-overlay</attribute>
+          <attribute name="action">win.show-help-overlay</attribute>
         </item>
       </section>
     </submenu>
     <submenu>
-      <attribute name='label' translatable='yes'>_View</attribute>
+      <attribute name="label" translatable="yes">_View</attribute>
       <section>
         <item>
-          <attribute name='label' translatable='yes'>_Fullscreen</attribute>
+          <attribute name="label" translatable="yes">_Fullscreen</attribute>
-          <attribute name='action'>win.fullscreen</attribute>
+          <attribute name="action">win.fullscreen</attribute>
         </item>
         <item>
-          <attribute name='label' translatable='yes'>_Look Busy</attribute>
+          <attribute name="label" translatable="yes">_Look Busy</attribute>
-          <attribute name='action'>win.busy</attribute>
+          <attribute name="action">win.busy</attribute>
         </item>
       </section>
     </submenu>
-    <submenu id='icon-menu'>
+    <submenu id="icon-menu">
-      <attribute name='label' translatable='yes'>_Icons</attribute>
+      <attribute name="label" translatable="yes">_Icons</attribute>
     </submenu>
-    <submenu id='time-menu'>
+    <submenu id="time-menu">
-      <attribute name='label' translatable='yes'>Time</attribute>
+      <attribute name="label" translatable="yes">Time</attribute>
-      <attribute name='submenu-action'>app.time-active</attribute>
+      <attribute name="submenu-action">app.time-active</attribute>
     </submenu>
   </menu>
 </interface>