Saving Private Ryan is only "English" in TMDb.
Thank you for telling me that TMDb would be a better source, but I still don't plan to add the language information to our database.
Netflix has an amazing assortment of shows in various countries, and I feel a desire to "collect" languages I've seen shows in.
I doubt there are many users like you. I suggest you could use the tags, for example "watched in Mandarin"...
Regarding the Netflix videos, I plan to add information about their audio languages and their subtitle languages. This feature could be quite useful as the official Netflix interface doesn't allow to filter by language.