code: public static Label.Builder addLabel(final Label.Builder labelBuilder, final Locale locale, final String label) {
          return addLabel(labelBuilder, locale.getLanguage(), label);
      }
docs: Add a label to a labelBuilder by locale. This is equivalent to calling
  {@link #addLabel(Builder, String, String)} but the language code is extracted from the locale
  by calling {@link Locale#getLanguage()}.
  
  @param labelBuilder the label builder to be updated
  @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