Support Right-to-Left layouts

Qt does this all automatically, we just need to hook it up

Source/Core/DolphinQt/Translation.cpp

@@ -294,6 +294,7 @@ static bool TryInstallTranslator(const QString& exact_language_code)
 
       QLocale::setDefault(QLocale(exact_language_code));
       UICommon::SetLocale(exact_language_code.toStdString());
+      QApplication::setLayoutDirection(QLocale(exact_language_code).textDirection());
 
       return true;
     }