code: public void translate(TranslationService translationService) {
      if (translationService == null) {
        description.setValue(descriptionKey.getValue());
        return;
      }
  
      if (!Strings.isNullOrEmpty(descriptionKey.get())) {
        description.setValue(translationService.translate(descriptionKey.get()));
      }
    }
docs: This internal method is used as a callback for when the translation
  service or its locale changes. Also applies the translation to all
  contained sections.
  
  @see com.dlsc.formsfx.model.structure.Group ::translate