fix spurious http cache bug: sometimes last-modified headers is generated using non-english local, which ends up in a date that twisted can't parse and make it feels the page may be cached while it may not
"""pre 3.2 bw compat:organization: Logilab:copyright: 2001-2010 LOGILAB S.A. (Paris, FRANCE), license is LGPL v2.:contact: http://www.logilab.fr/ -- mailto:contact@logilab.fr:license: GNU Lesser General Public License, v2.1 - http://www.gnu.org/licenses"""# pylint: disable-msg=W0614,W0401fromwarningsimportwarnwarn('moved to cubicweb.view',DeprecationWarning,stacklevel=2)fromcubicweb.viewimport*