Support for password change in back office UI

[jvelo]

No description provided.

[nesk]

One more thing to do with this issue is to improve responses for the /api/user/ endpoint. Currently, if you create a user with a password which doesn't meet minimum requirements, the server responds with a 500 HTTP code and the following payload:

{"message":"There was an error processing your request. It has been logged (ID d20c97197a0e31f7)."}

The only way to know the password is at fault is to read the server logs, not very user-friendly ;)

[jvelo]

Right. It gives the correct error when creating a customer (https://github.com/mayocat/mayocat-shop/blob/master/shop/customer/web/src/main/groovy/org/mayocat/shop/customer/web/TenantCustomerAccountWebView.groovy#L179) but not when directly creating a user.