protected function _checkVersion()
    {
        $edition = \OxidEsales\Eshop\Core\Registry::getConfig()->getEdition();
        $query = 'http://admin.oxid-esales.com/' . $edition . '/onlinecheck.php?getlatestversion';
        if ($version = \OxidEsales\Eshop\Core\Registry::getUtilsFile()->readRemoteFileAsString($query)) {
            // current version is older ..
            if (version_compare(\OxidEsales\Eshop\Core\Registry::getConfig()->getVersion(), $version) == '-1') {
                return sprintf(\OxidEsales\Eshop\Core\Registry::getLang()->translateString('NAVIGATION_NEWVERSIONAVAILABLE'), $version);
            }
        }
    }