Tiny tiny little fix to improve the core build... My school teacher community is freaking out!

CURRENTLY: Access to this group has been restricted to it's members only.
SHOULD BE: Access to this group has been restricted to its members only.

Whilst I'm here, the next line is:
You need to join the group first before you are allowed to view the contents of the group.
Not really anything wrong with that, but perhaps a simplification to avoid 'group' repetition:
You need to join the group to see this content.