increasing length of generated passwords to 12.
devise: beginning to override the password reset mechanism in order not to allow custom passwords but send generated passwords via email.
devise reset password: trying to override the devise controller.

Sorry, I have to use the master stage to test this out. There might be a few additional commits.
devise password reset: override the mechanism in the model layer rather than in the controller.

See comments in UserAccount#reset_password! .

trello: https://trello.com/c/2Sy0gQNO/485-passworter
devise password reset: minor locale correction.