Fix warning being shown when an account is locked
We had all of this wired up correctly in the backend, it just turns out that we overwrite all messages with "Unlocking failed" immediately after setting the string to the info message.
We need to always append as the account warning consists of two lines each as two events. It is reset when the grace timer (3 seconds) expires.
(if testing the command "faillock --reset will be useful :D)