Sync gettextutils from oslo-incubator

Partially implements bp user-locale-api

Change-Id: I1a053d9d0ad65ca90cac86196da68900b8fe112d
Fix cells manager RPC version

A previous patchset forgot to bump the version to 1.19.

Change-Id: Iecadcdcc4d75b9e9295f216b3375bfbf852a77e3
Merge "Fix cells manager RPC version"
Merge "Sync gettextutils from oslo-incubator"