Probably not the answer you are looking for but lots of sites that focus on movies give you the choice to sort by language. I know YTS has a mixed reputation but they are an example that offers language sorting.
Arabp2p doesn't need an invention IIRC, not sure though. ArabScene indeed needs an invention, but I honestly don't know how to get one. When I joined it, I managed to do that by getting an invention from one of my friends.