To clarify the above: I think removing `display_name` is probably an unnecessarily disruptive change; I think replacing it with `self.model_name.human.titlecase` and treating it as a class rather than instance method will be an almost-drop-in replacement for the `local_name_for` call it was making before; and the places where it returns different results are unlikely to break things (i.e. it's OK that it no longer functions as an instance method since we never used it as one before).