pages (login): catch ProfileUnknownError and show a C.PROFILE_AUTH_ERROR: ProfileUnknownError where not catched, resulting in an internal error when an invalid profile was entered. This patch fixes it by displaying a PROFILE_AUTH_ERROR, the same one as for invalid password.

import os.path

version_file = os.path.join(os.path.dirname(__file__), "VERSION")
try:
    with open(version_file) as f:
        __version__ = f.read().strip()
except NotImplementedError:
    # pyjamas workaround
    __version__ = "0.7.0D"