Was a bit shocked to see I can’t sort movies by Language in the web app. I got dozens of movies for my family who primarily speak a different language (and I don’t), so it’s going to be a bit tedious sifting through my Library now.
You can filter your libraries by available languages. This will work as an individual filter or as part of an advanced filter w/ combinations of criteria.

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Thank you! I actually just found that. But it isn’t showing the language of the movies I just added. Is there a way for me to fix that?
In case Plex had not yet picked up the language information from your audio tracks, it might help if you perform the Analyze action from the movie context menu.
If that’s not helping you should check out the file’s stream headers. For MKV files you can e.g. use MKVToolNix to set/change the language codes for all tracks. On a Mac you can use Subler to do the same for MP4/M4V containers.
2021 clean-up: implemented