For example, I use English UI, and would like to translate to English posts which are in non-English language. However, it seems that if post contains big parts of quoted text in English, even if all of the non-quoted parts are in other language, translate icon is not being shown.
E.g. this post in Dutch contains quoted parts in English, and is untranslatable .
The problem is still very there, no translate button if the first line is in the language as per the user’s profile interface language preference (Mine is set to English UK) so a Russian quote below an English starting sentence wont work.