[WEBSITE] plurality

[Leevie]

On the admin team page change the Sub headings from 
Aim Admin -> Aim Administrators

Jailbreak Admin -> Jailbreak Administrators

Surf Admin -> Combat Surf Administrators


Because there isnt just 1 Admin, there are multiple and it would make sense because The "Head Administrators" sub heading isnt "Head Admin"
ie.

[Byte]

The group names of the MyBB default groups are not plural.
So our custom groups aren't plural either.
If anything the current plural ones need to be converted to non-plural.

Any change would require also checking Discord<->Forums sync as well as Forums<->VIP sync.

[Leevie]

Yeah as long as it is consistent