code: private String localize(String key, String defaultValue) {
      String result = defaultValue;
      if (bundle != null) {
        try {
          result = bundle.getString(key);
        }
        catch (MissingResourceException mre) {
        }
      }
      return result;
    }
docs: Looks up key in the ResourceBundle and returns the corresponding value.
  If the bundle or the key doesn't exist, returns the default value.