In a recent question there were some comments with parts of them also in another language than English. While I now know the language requirement I don't think that it should be overemphasized. In questions and answers I totally agree, but I'm not so sure about comments. Ich will mir nur ungern vorschreiben lassen, in welcher Sprache ich schreiben soll.
The main reason for using non-english language was to be helpful. The question was then edited by a moderator and all the comments were apparently removed without notice. First I thought the question was created anew. I have looked in chat if the comments were moved there but did not find them.
So my question is if it is acceptable for a moderator to remove comments without notice or if this even could be called good practice in certain cirumstances.