Updated translations from Transifex.

I think we should probably change this workflow a bit.
- Stop listing updates in ChangeLog. I doubt many people care about
this and I don't like spending time updating it. We don't have enough
man-hours as it is, we shouldn't be spending our time with overhead.
- Always fetch/rebase/commit all translations from transifex before
releasing.
- Maybe stop listing translators in a help dialog and just point to
transifex, instead. Unless we think this is important enough to
keep updated within the codebase.