Add naming of Service Groups

[Florianisme]

We have created many Service Groups and it is becoming increasingly tedious to maintain and manage the Service Groups and Endpoints as only the Participant ID is shown in most places of the UI.
So far, we always have to keep a seperate spreadsheet at hand, which maps the Participant ID to a customers name.

I think being able to name the Service Group would enhance the User Experience by a lot.
Showing the name from the associated Business Card would be also an option.

[phax]

That is basically a duplicate of #54