On Chrome for Android you support the german language. But there’s a translation issue.
sign up and
sign in can be both translated into german with the verb
anmelden. This is what you did. It’s translated correctly. No issue with that!
But you’ll end up with two buttons saying
Anmelden. Just they’re formatted differently. That’s confusing!
You should use the german verb
registrieren if you mean sign up in the sense of creating a new account and the german verb
anmelden if you mean sign in in the sense of logging on.
I never noticed this issue because I’m using the english interface. But my girlfriend prefers to use the german translation.
Greetings from Vienna