code: private void addI18nListener() {
      model.translationServiceProperty().addListener((observable, oldValue, newValue) -> {
        if (oldValue != newValue) {
          form.i18n(newValue);
          newValue.addListener(categoryModel::updateGroupDescriptions);
          if (!Objects.equals(breadCrumbPresenter, null)) {
            newValue.addListener(breadCrumbPresenter::setupBreadCrumbBar);
          }
          categoryModel.updateGroupDescriptions();
        }
      });
    }
docs: Updates the internal FormsFX form with the most current TranslationService.
  Makes sure the group descriptions are updated with changing locale.