The Telegram chat network offers a convenient bot API. It would be pretty cool to translate at translatewiki.net using it.
... And just to mention that I managed to make it work during the Hackathon and actually did some edits—some of them crappy, but good enough for a proof of concept ;) The demo was well-received.
I want to continue hacking on it. The next step would be to actually make it stable, working and able to authenticate with real usernames, and start rolling it out to adventurous translators.
Thanks to everybody who helped.