Add an approval step (and probably change wording) when people make a new group

[cafelow]

@vagarwalla and @sebgrebe - for when Groups directory is updated

The idea I have is that if people want to register a new group they

1. Click "Register a group" button (Currently called "Create a group" but I prefer "Register" because if there isn't a group already then we'd like them to do a few other things before registering).
2. Change this statement "Please enter all the ways potential group members can currently connect with your group:" to "Please enter all the ways potential group members can currently connect with your group. You will need to include at least one form of contact for your group to be registered on the EA Hub. We prefer groups to have at least one non-Facebook contact method."
3. Then an email goes to [email protected], and potentially the other group admins for approval.
4. Then groups@ can get in touch - either to say "we've approved your group on the EA Hub" if we already know about the group, or share resources + offer a call if we don't know about the group, or ask for more information if they haven't shared enough for the group to be listed on the Hub (e.g. they haven't added any contact details).

Note: people have to be approved to register as an organiser of an existing group, so it would make sense that they also have to register a new group.