Add Gaia 2.0 support

I optimized VersionControl.php so that we don't have to change it anymore + using locales in context (did a few tests, looks like it works)
Also, we'll need to run setup.sh then glossaire.sh once it's merged.
One more nit (sorry but I realized it only now): the rest of the file doesn't use a semicolon after the condition, but put ```then``` a new line. I would keep that structure for consistency.

I also noticed there are three stray/unneeded semicolons around in initDesktopSourceRepo (too much PHP, I put semicolons everywhere...), not sure if you want to fix them or let them be ([example](https://github.com/TheoChevalier/transvision/blob/gaia_2_0/app/scripts/setup.sh#L154)).