Are questions about non-English TV & Movies on topic on this website? Does the community have sufficient familiarity with foreign films/tv to justify asking these sorts of questions here?
Yes they are on-topic, but the questions themselves have to be asked and answered in English.
By 'justify' I think you mean 'will I get good answers about non-English language movies and TV'? By our very nature we are English language centric as a community - but we do have a reasonably significant contingent from non-English speaking regions of the world, and many for whom English is their second language. Already we have a small number of questions about (non-British/Irish) European and Indian movies. We even have an Indian Movies specific chat room.
I suggest you ask and find out.