"Create Account" Button should be inactive/hidden when "globalSettings__disableUserRegistration=true"

Hi everyone,

The topic is not entirely new and an attempt has already been made to address it with issue #631 . Unfortunately the task was closed.

But I would still be of the opinion that it would make sense to deactivate the "Create Account" button and hide it as soon as the config option globalSettings__disableUserRegistration is set to "true".

At the moment it is possible to enter all data including email, username and password and only on submitting the register form user gets an error toast. This is somehow unnecessary and also arouses false expectations among users