Bug 1393536: More tidying up

Including:
- making add connection form cancel back to connections page
with correct institution selected
- Adding a help icon/page (needs content) for add connections
- Display tick/cross next to connection name to see if it is enabled
- Have the 'enable connection manager' master switch bunched with the
others
- Changing some strings to make thing clearer

behatnotneeded

Change-Id: I875ad6ec745cd136338017e27ef49542157cac7c
Signed-off-by: Robert Lyon <robertl@catalyst.net.nz>