Improve UX of sign up errors for the demo instance

It's not nice for users to see that [KratosError] part of the error message. We need to remove that part.

We can also make the error message more user-friendly in these 2 cases at least:

  • Entered valued is not an email address
  • Email address has already been used

Screenshot_from_2023-03-02_14-49-03

Edited by Syrine Neifar
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