Currently, REALM_TYPE is just an array of string values:
https://github.com/theforeman/foreman/blob/develop/app/models/realm.rb#L7

It would be helpful if what's checked in the template and shown in the UI could be different. It
may be as simple as humanizing the string.

For example, Satellite would like to show "Red Hat Identity Management" in the UI, but leave
the templates untouched.