Confirm passwords on registration page does not work

[Debagnik]

Steps to reproduce:

1. go to /admin
2. ensure registration is enabled
3. try creating a new user
4. on the password field and confirm password field set different values
5. Observe that no error is thrown and a user got created.

Expected behaivior

• an error should be thrown when password and confirm passwords are mismatched Actual behaivior
• no error thrown and a user is created when the password and conform passwords are different.

[Debagnik]

Fixed as a part of #32