I have been finding that when I want to comment on a post through the browser on my iPhone, I'm only able to comment in English. If I switch my keyboard to a Japanese keyboard to comment on posts written in Japanese, I redirected from the comment page to Feed page and am not allowed to comment. I don't know why this is, but I would be happy if I could comment from my phone in a language other than English. It's not a problem when I'm commenting from a computer.