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/PluginManager.cpp

@@ -988,8 +988,8 @@ void PluginRegistrationDialog::OnOK(wxCommandEvent & WXUNUSED(evt))
    // we will leave the project window in an unusable state on OSX.
    // See bug #1192.
    {
-      ProgressDialog progress(
-         TranslatableString{ GetTitle() }, msg, pdlgHideStopButton);
+      ProgressDialog progress{
+         Verbatim( GetTitle() ), msg, pdlgHideStopButton };
       progress.CenterOnParent();
 
       int i = 0;