In Lemmy, you can choose your languages under Settings -> Languages. The main problem is that Lemmy currently doesn’t have any mechanism to automatically determine a post’s language and instead relies on users to set the language for each post and comment. Therefore most content is marked as “Undetermined”.
You keep using that word. I don’t think it means what you think it means.
I‘m using my private instance to interact with your post on lemmy.ml. That’s federation.
Edit: oh great, lemmy is back to showing four year old posts as hot.