message: Mark unused plural forms as such
  Recent changes to Crowdin may cause such forms to appear.
diff: @@ -658,9 +658,16 @@ void EditingArea::RecreatePluralTextCtrls(CatalogPtr catalog)
  wxString desc;
  if (formsCount == 1)
  + {
  desc = _("Everything");
  + }
  else if (examplesCnt == 0)
  + {
  + #if 0 // kept just in case, for translations
  desc.Printf(_("Form %i"), form);
  + #endif
  + desc.Printf(_("Form %i (unused)"), form);
  + }
  else if (examplesCnt == 1)
  {
  if (formsCount == 2 && firstExample == 1) // English-like
  