Static messages are not localized when requested

[Brant Knudson]

Messages created at import-time are not being translated when
the request is made with Accept-Language.

Note that messages created a run-time are being translated.

Since not many messages are translated at this point, to recreate
can set a translated message yourself. For example, update
keystone/keystone/locale/it_IT/LC_MESSAGES/keystone.po:

 #: keystone/exception.py:101
 msgid "The request you have made requires authentication."
 msgstr "Wonderful Italian rendition of this"

before running `python setup.py compile_catalog`

Then run Keystone and request a resource that requires authentication.

curl -s -H "Accept-Language: it" http://localhost:5000/v3/auth/tokens | python -mjson.tool

{
    "error": {
        "code": 401,
        "message": "The request you have made requires authentication.",
        "title": "Unauthorized"
    }
}

-- this should return

{
    "error": {
        "code": 401,
        "message": "Wonderful Italian rendition of this",
        "title": "Unauthorized"
    }
}

[OpenStack Infra (hudson-openstack)]

Fix proposed to branch: master
Review: https://review.openstack.org/43208

[OpenStack Infra (hudson-openstack)]

Reviewed: https://review.openstack.org/43208
Committed: http://github.com/openstack/keystone/commit/2fe72a0d5786ad633daea769ddbbd2e2d9be2406
Submitter: Jenkins
Branch: master

commit 2fe72a0d5786ad633daea769ddbbd2e2d9be2406
Author: Brant Knudson <email address hidden>
Date: Wed Aug 21 18:30:56 2013 -0500

    Fix translate static messages in response

    Messages created statically (during import) were not being
    translated in responses when the Accept-Language header was
    used to set the expected language in the response. The static
    messages were being created before the _ built-in had been
    installed by gettextutils.install().

    Change-Id: Ie56b1d3a836bc5f2262d7af68f803a08ebdf016f
    Resolves-Bug: #1215192