Hey. I tried to signup, and it redirected me to the login page in the french language. My locale is English. After manually changing the url to use English, and trying to Sign In, it redirected me to the French Signup Page.
I signed up and was presented with a French dashboard page. Everything was in English before. I manually changed the 'fr' in the URL to 'en' and then everything seemed to work fine :-).
I had this same experience, and between this experience and the GP comment -- how in the world is asking users to do URL surgery considered a valid UX? To say nothing of the hubris of ignoring the `accept-language:` header sent from every browser since I can remember
Something strange is going on.