Updating language of audio tracks of shows and movies

I noticed that a lot of my movies and episodes of shows are listed with ‘unknown’ language as audio track.
I’m using MKVToolNix to set the language of my audio tracks to the right language, but Plex still lists these files as ‘unknown’. I have tried using “analyze” and “refresh metadata” on these items, but still the language remains marked as ‘unknown’. How should I fix this?

Read this post Plex claims audio language is "Unknown" even though file metadata includes language info - #2 by OttoKerner
Start at the 3rd paragraph.

Thanks for your reply, I’ll take a look at the tags and mark the video with a language as well.

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