Set new password ("change password")

[KaizerTilt]

As a user I want to set a new password for my account so that I can use the new password the next time I log in.

Acceptance Criteria

1. When I provide the correct current password and a valid new password:
   • The password for my account should be updated.
   • I should be notified that the password update was successful.
   • After I log out, I should now be able to log in with the new password only.
2. When I provide incorrect current password or invalid new password:
   • I should be notified of the error(s), and which form fields they refer to.
   • I should be able to try performing the password update again.