Add caption to ControlPanel LayoutSwitcher (#5103)

* Update LayoutSwitcher.tid

* Update ControlPanel.multids

core/language/en-GB/ControlPanel.multids

@@ -44,6 +44,7 @@ KeyboardShortcuts/Platform/Linux: Linux platform only
 KeyboardShortcuts/Platform/NonLinux: Non-Linux platforms only
 KeyboardShortcuts/Platform/Windows: Windows platform only
 KeyboardShortcuts/Platform/NonWindows: Non-Windows platforms only
+LayoutSwitcher/Caption: Layout
 LoadedModules/Caption: Loaded Modules
 LoadedModules/Hint: These are the currently loaded tiddler modules linked to their source tiddlers. Any italicised modules lack a source tiddler, typically because they were setup during the boot process.
 Palette/Caption: Palette

core/ui/LayoutSwitcher.tid

@@ -1,5 +1,6 @@
 title: $:/snippets/LayoutSwitcher
 tags: $:/tags/ControlPanel/Appearance
+caption: {{$:/language/ControlPanel/LayoutSwitcher/Caption}}
 
 <$linkcatcher to="$:/layout">
 <div class="tc-chooser">
@@ -13,4 +14,4 @@ tags: $:/tags/ControlPanel/Appearance
 </$list>
 </$list>
 </div>
-</$linkcatcher>
+</$linkcatcher>