docs: private String getUploadVariantMessage(UploadVariant variant) {
  
          String message = null;
          switch (variant) {
              case basic:
                  message = key(Messages.GUI_PREF_USE_UPLOAD_BASIC_0);
                  break;
              case gwt:
                  message = key(Messages.GUI_PREF_USE_UPLOAD_GWT_0);
                  break;
              default:
                  message = key(Messages.ERR_PREF_UPLOAD_VARIANT_NOT_FOUND_0);
                  break;
          }
          return message;
      }