LBaaS v2 is now the only LBaaS implementation.
It is time to allow translator to translate LBaaS v2 dashboard.
This commit sets up related files according to the infra guide [1].
Also removes Babel related entries in setup.cfg. They are not
sufficient as Django requires two PO files (django and djangojs).
After this change is merged, I will propose the infra change.
This change can be part of newton release. If it is part of Newton
release of neutron-lbaas-dashboard, translators can translate it
even after the initial Newton release and we can import them
in the stable update release.
[1] http://docs.openstack.org/infra/manual/creators.html#enabling-translation-infrastructure
Change-Id: If3cf48dfe9c61499b2a4221dea956aa0bccf5f85