code: public static String getString (final String key, final Locale msgLocale) {
          /*read message resource file.*/
          ResourceBundle RESOURCE_BUNDLE = ResourceBundle.getBundle(BUNDLE_NAME, msgLocale);
          try {
              return RESOURCE_BUNDLE.getString(key);
          } catch (final MissingResourceException e) {
              return key;
          }
      }
docs: get specific message by key and locale.
  @param key key
  @param msgLocale locale
  @return string