code: public String getDisplayValue(Object ob) {
          if( ob == null ) {
              return "";
          }
          if( ob instanceof Translator ) {
              return getDisplayValue(Locale.getDefault(), ob);
          }
          return ob.toString();
      }
docs: Provides a display value for an instance of this data type. If the value is a
  multi-lingual {@link Translator}, then this method will provide the display value
  for the default system locale as defined in {@link java.util.Locale#getDefault()}.
  @param ob the value for which a display value is being sought
  @return the display value for the specified value