Ablug Weblate / Imecwaṛen
After about week of (not so heavy) development, I can announce availability of Weblate - web based translation tool with tight Git integration.
For some time, we use Pootle as online translation tool for phpMyAdmin. It is indeed great tool, but somehow we seem to be hitting more and more issues with it and I feel it really won't fit nicely once we will want to support translations on two divergent branches. Also it's code base is not something easy to understand so that I would be able to fix bugs myself without major effort.