Language information in Session for anonymous users I selected the language preference to be detected with user sessions, the problem is that for anonymous user this preference does not seem to be stored. As this site is not user driven (Meaning that site users don t need to create account in order to browse the site), it s very problematic. 

Is there anyway to have this language preference stocked in anonymous sessions ?
For Drupal 7 it's normal, there's no session created automatically for anonymous users, we created a new module that stores and detects the language inside a cookie, see locale_cookie, the benefit of a cookie is that your session table stays small.