Updated openstack/openstack
Project: openstack-dev/devstack  6518c0b88ea52e93513fa34dd63eeb4596875212

Compile Horizon message catalogs during stack.sh

Recently compiled message catalogs (mo files) were removed
in Horizon and django_openstack_auth repositories.
We need to compile message catalogs to make translations
available for Horizon users. It is useful for developers too.

Change-Id: I0831e8308205c116d8e3bb8b43be7f0dd6fa0c0a