What should we do with comments in languages other than English? This isn't about referencing specific non-English terms. It's about comments that are completely written in a language or languages other than English. For example (user names suppressed here; UPDATE: the referenced comments have since been deleted):
Hmm... meinst du nicht, der Krug hat wiedermal eine kleine Entkalkung verdient?
ja, aber es ist eine WG und der Krug gehört mir nicht
Krug, oder Bild?
das Bild hat eine Entkalkung verdient?
ah, ja, kenn ich.
- recognise that we live in a multicultural society, so anyone can use any language we like (there's always google translate); or
- note that Stack Exchange communication is typically conducted in the English language, so everyone should use English as the 'trade language'?
(I suppose it's something of a non-sequitur to point to the E in EL&U and require discussions to be in English since the topic being English doesn't necessarily require the discussion about that topic to also be in English.)