[Workshop] - Modernizer - User registration UI error

In the workshop you can create a user to log into the website.

When the user is created the UI generates an error indicating the password is not valid, but the workflow continues and the user is created.

The only message provided is

```
Error: Validation failed
```

This sequence of events, that even if they succed at the end and the user is created, can cause some confusion to some of the workshop participants.

Start by reproducing the workshop user-registration flow and trace the UI handling around the password validation error. Determine why a successful user creation still displays “Validation failed ”; done means the registration workflow completes without a misleading error message.

Written by the indexing model from the issue text.