Actually, the 767 was the first fleet to be fitted with AVOD and so far is the only fleet to be relatively trouble free with its AVOD updates.
Having said that there is not really a system available to play in different languages. Sometimes movies have French/Spanish or Hindi available depending on the route. One of these languages may be available on your flight but it seems to be a bit of a grey area as everytime I get asked this question onboard and I ask the CSD about it I never seem to come back with a complete answer! lol!
What language are you looking for?