xWiki in multi languages

Hello I don't success to make my xWiki Multi Lingual. I activated in the XWiki.Preferences, paremeters sections the option Multi Lingual set to Yes. Add fr in language section with english like this : "en fr" But it doesn't add the "fr" language in the home page . I can only see "en". I modify a page but adding this '?language=fr' to the URL, it modifies the content for en too. Do you know what I did wrong ? -- Xavier MOGHRABI - Consortium ObjectWeb Email: xavier.moghrabi at objectweb.org Phone: +33 4 76 61 52 35 - Skype ID: xavier.moghrabi.bureau