[IMPLEMENT] Add notification for "log in to AStA Copyclient" on fakeprint, in addition to show+focus

Add a notification that shows sth. like this: "Log in to AStA Copyclient using your App-Account or Copycard credentials" to fakeprinting, for when for some fuckingly dumb reason the window doesn't want to show+focus. Just do both.

Implement this, it's awesome!