Custom display name for page types

[simonprast]

Is your feature request related to a problem? Please describe.
The customer is confused of english and technical page type names.

Describe the solution you'd like
There shall be the option to set a custom display name for any page type.
E.g. you should be able to display ApartmentPage as Wohnung.

It would be even better to set different locales through this option.
On ApartmentPage:

{
  "en": "Apartment",
  "de": "Wohnung",
  "af": "Another bombed place"
}