Unfortunately this did not resolve the issue, however we ARE getting somewhere I think.
Before, I would go into my AdCenter account and look at the Language settings and it was set to English, however when I completed your steps 1-3, it did indeed show it as French so that is obviously where this is occurring.
However when I finished all of your instructions and clicked on "I do not have an adCenter account and want to establish one" it took me to the AdCenter homepage which was unfortunately still in French even when it seemed to register my changed language setting after step 4.
Anything else to try with that? No idea why that would be bugged like this.