The columns were out of alignment for me, so I thought I’d display it as a table:

I think this is the way language settings are supposed to work. When I tried it, it wasn’t actually possible for me to un-select ‘Undetermined’ and for the change to go through. So we all have ‘undetermined’ pre-checked, but typically don’t won’t to see posts in every language available, so it only shows posts where a language wasn’t specified. From then, we choose the language(s) we understand and leave everything else unchecked. Since you had English unchecked (the same as anybody else who doesn’t understand it), your posts were hidden.

It would be straight-forward to script I think (especially if your account is on the same instance). API calls to get a list of all an instance’s communities, then loop through the list, and sub to each one. I guess you’d then want a background version, occasionally checking for something new.