[FIX] http: setup_lang in Safari

When not logged in the webstie on Safari and clicking on "Have a Question? Chat with us",
it creates a mail.channel from get_mail_channel and it also creates a translation.
But with Safari, the accept_languages is set with the value 'fr-fr', and this value was set
in the context as the lang='fr_fr'. So when the translation was created, a bad insert query was
raised in sql because the lang didn't exist in the res.lang table. When a translation is created,
the function _get_languages checked that the language is in the table.
So it was impossible to use the chatter when the user is not logged.

NB: interseting functions to see:

-setup_lang in odoo/http.py
-_dispatch in addons/website/models/ir_http.py
-get_mail_channel in addons/im_livechat/models/im_livechat_channel.py

opw:716519

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