Problem/Motivation
Currently contact categories are exposed to own URLs contact/{contact_category} so actually they are not categories but separate forms on their pages (except personal)
So managing categories is confusing.
Proposed resolution
Rename contact_category entity to contact_form and all relates strings/menus
That was suggested in #1997692-33: Regression: category selector missing on site wide contact form
Remaining tasks
discuss and file patch
User interface changes
UI strings
API changes
tbd