Hi David,
LOL 🙂 I never thought that somebody would ever notice that!
This is because we received an insane amount of Spam users lately, mainly from russian email addresses (… @mail.ru). These are fake users that create an account for malicious purposes, for instance to hack a site, to post spam or to see if stolen credit cards are still valid. Therefore we had to change the login/registration page url. Because these accounts are mainly created by bots (software) they just try to use the standard login url of a WordPress site and not the real one.
Why I chose keksi as a name? No idea, was just the first thing that came to my mind and I knew the girls would remember. Ans yes, it means a small cookie, also in German (maybe Austrian only).