In institution administration navigation. Change
- "Manage users" to "Users"
- "Manage groups" to "Groups"
- "Manage institutions" to "Institutions"

Change - "Institution statistics" to "Statistics"

Move "Admin notifications" from site admin "Users" tab to "Institutions"
tab right after "Admins"

Fix the order of menu items in Institution admin menu: 
... Share Files Statistics ...

Change-Id: Id01f470e5d2b82c613e21f4eb8e4cbfdfe55a59c
Signed-off-by: Son Nguyen <son.nguyen@catalyst.net.nz>