Bug 15494: Update display of renewal errors

Bug 15494: Update display of renewal errors

To test:
1 - Define a rule to deny renewal
2 - Checkout an item meeting this rule
3 - Attempt renew an item via the OPAC
4 - Attempt renewal via SIP
5 - Attempt renewal via staff client
6 - Verify errors are reasonable

Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Katrin Fischer <katrin.fischer.83@web.de>
Signed-off-by: Nick Clemens <nick@bywatersolutions.com>