I am not a heavy user of MB but to me, it makes sense to group releases in this scenario into one release album.
I run into this issue a lot with Indian films, a lot of which get dubbed and released in multiple languages. When I look them up or use Picard to tag these albums, I want them to be linked together as they are the same film. The language doesn’t change the story or the plot of the movie. In addition, the tracklist and the artists tend to be the same on the different releases. Given that, I think it makes sense to have one release group per film with each language as a release within that release group.
Here are a couple examples of Indian films with soundtracks in multiple languages for context:
https://en.wikipedia.org/wiki/Guru_(soundtrack).
https://en.wikipedia.org/wiki/Baahubali:The_Beginning(soundtrack)