Describe the bug
I see the logic of friends invitations was deleted in #4430 but the badge is still there and only is posible to earn if you are admin and send "private users" invitations.

So we have to remove this badge because is not possible to all users to send invitations.

I can make a PR if we are agree with that.

To Reproduce
Try to send invitations as normal user.

Expected behavior
Expected to have the posibility earn the badge or remove the badge "invitations" from the list.

Screenshots