docs: @Override
    public final synchronized void handleDataChanged() throws Exception {
      this.langPreferences = null;
      this.languages = null;
      this.decSeps = null;
      this.decGrSeps = null;
      this.logger.info(null, HndlI18nRequest.class, "I18N changes are handled.");
      if (this.additionalI18nReqHndl != null) {
        this.additionalI18nReqHndl.handleDataChanged();
      }
    }