Define and use function Verbatim...

... in cases of "TranslatableString" that are not really translated.

This makes it easier to scan the code for such unusual constructions of
TranslatableString, distinct from mere mentions of the TranslatableString type.

src/toolbars/ToolBar.cpp

@@ -386,7 +386,7 @@ void ToolBar::SetLabel(const wxString & label)
 {
    // Probably shouldn't reach this overload, but perhaps virtual function
    // dispatch will take us here from a pointer to the wxPanel base class
-   mLabel = TranslatableString{ label };
+   mLabel = Verbatim( label );
 }
 
 void ToolBar::SetLabel(const TranslatableString & label)