code: public static Label buildLabel(final Locale locale, final String label) {
          return addLabel(Label.newBuilder(), locale.getLanguage(), label).build();
      }
docs: Create a new labelBuilder and register label with given locale.
  
  @param locale the locale from which the language code is extracted for which the label is added
  @param label  the label to be added
  
  @return the updated label builder