Thank you for chipping in!

I guess I have to keep my eyes open for movies series in my own language and hope they come with the original (English) sound included.

But if not: how does the whole remuxxing work? I have literally zero ideas how to get started with that. Where do you find the right (non-english) audio track(s) for the movies? Which software do you use? Etc…

Thanks for the link for Radarr dual-language setup! I came across it before :)