This suggestion might already exist, but I didn’t find it.
I watch a lot of international content, and it would be helpful to be able to identify the language tracks associated with a video file, either so I can see all my, say, Japanese shows at once, or so I can spot cases where the language tracks are incorrectly identified to fix them at my end.
This is distinct from Browsing videos by country of origin - #9 by Galdo320 - that item appears to be suggesting to pick the metadata from the database; this would be picked up from the video file itself. (I think both would be helpful in different ways.)
It would be particularly useful for videos with multiple audio tracks - eg, allowing the user to identify an anime video that contains both the original audio and a dub.