Fix UX antipattern in term use in Groups UI
UX Antipattern: "Members" and "users" overload the same object -- a user.
Stories:
- As an Owner I want to add User(s) to my User Group so that they can Use the repos owned by my Group.
- As an Owner I never want to see the word "Members" on a github UI again so that I am not incensed by the anti-pattern of using multiple terms to refer to the same object.
Proposal
Standardize to "Members" everywhere.