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/xml/XMLFileReader.cpp

@@ -59,9 +59,9 @@ bool XMLFileReader::Parse(XMLTagHandler *baseHandler,
          // We could make a table of XOs if we wanted so that it could
          // If we do, uncomment the second constructor argument so it's not
          // a verbatim string
-         mLibraryErrorStr = TranslatableString{
+         mLibraryErrorStr = Verbatim(
             XML_ErrorString(XML_GetErrorCode(mParser)) // , {}
-         };
+         );
 
          mErrorStr = XO("Error: %s at line %lu").Format(
             mLibraryErrorStr,