Reword invalidsession view
Reword invalidsession view

The changes here should both address errors detected under review and
make the text provided easier to understand for non technical users
who will be the primary recipients.

ausaccessfed/rapidconnect,ausaccessfed/rapidconnect,University-of-Auckland/rapidconnect,University-of-Auckland/rapidconnect,University-of-Auckland/rapidconnect,University-of-Auckland/rapidconnect,ausaccessfed/rapidconnect,ausaccessfed/rapidconnect