Add babel*.cfg files for translation.
This follows the setup for django projects for translation, for details
see
http://specs.openstack.org/openstack-infra/infra-specs/specs/translation_setup.html
babel related entries in setup.cfg does not work for multiple
POT/PO files, so we can remove them.
Change-Id: I1fac32fc76c1469e88417ca0d26bdd199995a402
