I agree completely with "comments in English, please". but despite not learning any German for over 50 years, I came up with "One think works", which is not too far off!

Submissions are community property, so to speak, so the rules are stricter for those.

There's a lot more room for individual expression in comments. If someone's quoting a saying or making a quip that's best expressed in another language, that's fine. If they're consistently posting in a way that most people here can't understand, we'd ask them to stop.

Submissions have to be in English. The problem with the GP comment is not that it's not in English, it's that's it's tropey and unsubstantive. Just flag bad comments and move on.

Kannitverstaan! Was Du saggn?