[request/session] refactor language handling: don't attempt to sync web/repo languages This decouple thing and make code easier to understand. Previous behaviour was fine w/ validation error that were translated on the server side, but isn't satisfying for notification and all. Now: * translations should be done on the ui side (see previous validation error refactoring) * consistent behaviour: each side (web/repo) is responsible to deal with its request/session of language, no weird interaction between them on this topic * drop on the way the 'session properties' api, used only for that matter. -> much simpler/cleaner/saner api The thing missing being a way for user to tell "My favorite language is xxx but I also want cw to consider my http language header)

# Run all scenarii found in windmill directory
from os.path import join, dirname
from cubicweb.devtools.cwwindmill import (CubicWebWindmillUseCase,
                                          unittest_main)

class CubicWebWindmillUseCase(CubicWebWindmillUseCase):
    #test_dir = join(dirname(__file__), "windmill/test_edit_relation.py")
    pass


if __name__ == '__main__':
    unittest_main()