Bug 935877 - Enable VTCS and Lightbeam for more locales

Added locales:
* VTCS: es-AR, fr, fy-NL, mk, pl, sq, uk
* Lightbeam: cs, cy, fy-NL, pl, uk

If possible merge this PR just before the next push to stage/prod: this way we'll have only one pending PR on this array in base.py and I can keep adding locales as soon as they become available. If that's not possible, PR is good to go at whenever you prefer :-)