code: @Override
    public final synchronized void handleDataChanged() throws Exception {
      this.i18nAccountingList = null;
      this.i18nCurrencyList = null;
      this.logger.info(null, HndlAccVarsRequest.class,
        "I18N changes are handled.");
      if (this.additionalI18nReqHndl != null) {
        this.additionalI18nReqHndl.handleDataChanged();
      }
    }
docs: <p>Handle data changed event.</p>
  @throws Exception - an exception