Fix AttributeError for "lang" on repo/client connections This is a regression introduced by b48020a80dc3, which removed call to set_language from the `req._set_user` method. This is fine, but we still want a language on connections, so we've to handle it if necesary in Connection.__enter__ (i.e. once connection is properly open). When using pyramid front-end, which has a users cache, we've to cache its language as well because we must not access its preferred_language method since it's not bound to a proper connection.

.. _web_module:

:mod:`cubicweb.web`
===================

.. automodule:: cubicweb.web

    Exceptions
    ----------

    .. autoexception:: DirectResponse
    .. autoexception:: InvalidSession
    .. autoexception:: PublishException
    .. autoexception:: LogOut
    .. autoexception:: Redirect
    .. autoexception:: StatusResponse
    .. autoexception:: RequestError
    .. autoexception:: NothingToEdit
    .. autoexception:: ProcessFormError
    .. autoexception:: NotFound
    .. autoexception:: RemoteCallFailed