[welcome] Only show (country) in list if the locale suggests it

- A locale suggests it is country-specific by having the form <lang>_<country>
 - This mostly fixes locale "ar" being presented as "Arabiy (Misr)" when
   there is no need to (and the RTL is messed up then, too).

src/modules/welcome/WelcomePage.cpp

@@ -141,7 +141,7 @@ struct LocaleLabel
         QString sortKey = QLocale::languageToString( thisLocale.language() );
         QString label = thisLocale.nativeLanguageName();
 
-        if ( QLocale::countriesForLanguage( thisLocale.language() ).count() > 2 )
+        if ( locale.contains( '_' ) && QLocale::countriesForLanguage( thisLocale.language() ).count() > 2 )
         {
             sortKey.append( QString( " (%1)" )
                             .arg( QLocale::countryToString( thisLocale.country() ) ) );