using
- Mozilla/5.0 (Windows NT 5.1; rv:32.0) Gecko/20100101 Firefox/32.0
- lang ($_SERVER["HTTP_ACCEPT_LANGUAGE"]):
fr,fr-fr;q=0.8,en;q=0.7,es;q=0.5,en-us;q=0.3,it;q=0.2
But
Login page admin/login.php is always in English
not in french

So Forgot your password and message sent are also in English