* @return An optional containing the query languages array, or empty if not available.
     */
    protected OptionalThing<String[]> getQueryLanguages() {
        return LaRequestUtil.getOptionalRequest()
                .map(request -> ComponentUtil.getFessConfig()
                        .getQueryLanguages(request.getLocales(), (String[]) request.getAttribute(Constants.REQUEST_LANGUAGES)));
    }

    /**