I selected English as the language of use in my blog, but it stayed limited to the dashboard. The blog was showed with categories in French. I didn't notice when I signed in that it was in French, since I speak both languages. For the blog has a content in English, I'd like everything to be in English for readers.
I'm not quite sure what your question is. Do you think you could ellaborate a little bit on your problem including some specifics(not in violation of the TOS)? This will enable us help you a little better.
I think that I wasn't that clear then. It's just an account in blogspot. I'd like to know if it's possible to change its interface from French to English. Is there any option I didn't see? The blog appears with "commentaires" instead of "comments", and "afficher profile" instead of "show profile".