public static function isInstalled($iso_code)
{
if (self::$_cache_language_installation === null) {
self::$_cache_language_installation = array();
$result = Db::getInstance()->executeS('SELECT `id_lang`, `iso_code` FROM `' . _DB_PREFIX_ . 'lang`');
foreach ($result as $row) {
self::$_cache_language_installation[$row['iso_code']] = $row['id_lang'];
}
}
return isset(self::$_cache_language_installation[$iso_code]) ? self::$_cache_language_installation[$iso_code] : false;
}
