external library login

Hello,

I use a control form to login with external librarys was delivered with SC9.
It’s run fine, but i have 3 questions

how can a define a language change field.

how can i translate the placeholder in libraries login01.html

how can i define that the titel in header translate e.g. english=“Sign In” (defalt) if i change the language then e.g. to german=“Login”

Hello, did you find the answers, I have the same question. Thank you.