Initialize transifex data for openstack-manuals

Maintaining transifix in git causes some problems, we're removing it
now from openstack-manuals and thus need to initialize it here.

The manuals change at https://review.openstack.org/#/c/79859 is waiting
for this to go in.

Change-Id: I1bc1e1ae0f25ce5d88a70cdbab2541c8a52ddd78
Merge "Initialize transifex data for openstack-manuals"