It is not used anymore, now that translations are bundled with
the extension. Also, in the zip files it ended up with my home
folder, which is not nice.
Cherry-picked from master, added code to load translation from
within the extension folder.
This is the stable release, so we support all of GNOME Shell
stable cycle without updates.
(As said earlier, dock and alternate-tab have issues, so they're
not marked 3.2 but just 3.2.0)
