Add babel config
Add babel config

The babel.cfg file identifies which files should be used for
translation.  This change set adds the file and identifies that only the
python files should be considered.

Change-Id: I316391b103baee80352abc429115648ab1f0a8d6

stackforge/nova-powervm,stackforge/nova-powervm,openstack/nova-powervm,openstack/nova-powervm