[UX] user interaction setting new local passwords with activated policy

[ruKurz]

Motivation

PR #9857 implements a local password policy. This has an effect on the user interface when a new password has to be assigned. The implementation of this issue is intended to make it as easy as possible for users to set a new password that matches the policy.

From the user perspective it would be great to see the constraints when setting a new password.

Current situation

As a user, I want to change my password. After entering a password, that does not match the required criteria, I get a message that only tells me that the password does not fulfill the policy.

Expected behavior

The user is provided by an visual description that explains the required criteria in a human friendly presentation.

Nice to have

When not matching the policy, the user gets an information which of the criteria is not fulfilled.

[ruKurz]

@arthurgiustina do you need further thoughts on that? Maybe we can have a look at a software that has a nice solution already? WDYT?