re 1) It could be useful to know for people to comment with the journal owner in a language other than the one the entry is written in. For example I post in English for the benefit of international readers, but my native language is German. That is not readily apparent from my profile, which is focused on content. If another German-speaker who reads English and follows my journal felt more comfortable commenting in German because they spoke that better, they could see that I have no trouble reading that, whereas now they might decide to forgo communicating in a foreign language.