Messages returned from API to openstack command are not being translated based on locale is set in the env

[prashkre]

In an environment with locale set to something like nl_NL.utf8, openstack command lets say "openstack project delete proj1" is not passing "Accept-Language" header through openstackclient or keystoneclient code internally to identity API, due to which at [0] req.accept_language is showing as None and messages which are sent from API to openstack commands are not translated based on locale set in the env.

[0] https://github.com/openstack/keystone/blob/master/keystone/common/wsgi.py#L128