New comment by ericonr on void-packages repository

https://github.com/void-linux/void-packages/issues/27255#issuecomment-755762106

Comment:
@Chocimier adding that into `files/mozconfig` makes it apply the language from the `LANG` env var, without having to follow any manual steps.

I will open an issue about applying it to all our mozilla stuff, and will include it in #26896