Different languages metadata

I haven’t found a way to do this yet so any ideas…? If not then certainly a suggestion for the future:

I have films in different languages and have divided them into different shares on my NAS. The default language of my apple tv and the bulk of my films are in English, but that really mucks up the metadata pulling for all the (eg) French films… I would so love to be able to specify by some way or other the languages of all the files in a certain folder and therefore pull metadata for each film in its correct language.