public static function getLangISO()
{
if (self::$LAST_USER !== false) {
return self::$LAST_USER->getLangISO();
} elseif (self::$LAST_CHANNEL !== false) {
return self::$LAST_CHANNEL->getLangISO();
} elseif (self::$LAST_SERVER !== false) {
return self::$LAST_SERVER->getLangISO();
} else {
return 'en';
}
}