code: public String key(Locale locale) {
  
          if (getBundle() == null) {
              return getKey();
          }
          return getBundle().getBundle(locale).key(getKey(), getArgs());
      }
docs: Returns the localized message described by this container for the given locale.<p>
  
  @param locale the locale to use
  @return the localized message described by this container for the given locale