I worked three years for quiet a few filmproductions, mostly german TV-production, but also bigger projekts like 'V for Vendetta' to name the biggest ;)
I handle TV-sets and Computers that are used as part of the set and play; a running TV in the room, showing the hintgiving newsflash or the laptop used to run a cellphonesweep, that sort of thing.
I don't think it will become a big problem, but i will gladly help with the german language, spelling of signs, textadaption, talking german on camera.