Adrien Di Mascio <Adrien.DiMascio@logilab.fr> [Mon, 20 Jan 2014 09:13:12 +0100] rev 9434
[test] remove custom implementation of FakeRequest.header_accept_language() (closes #3375021)
``Accept-Language`` should be overridable just as any other request header.
Default value is "nothing" since the application should be able the empty
header case.