Bug 19540: Tell the patron why a hold cannot be placed on items

Bug 19540: Tell the patron why a hold cannot be placed on items

This patch adds an explanation when a hold cannot be placed, in some situation:
tooManyReserves
tooManyHoldsForThisRecord
tooManyReservesToday
itemAlreadyOnHold

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 01985605434b7b78cb8f234f8ea66e0a16b3f8c5)

Signed-off-by: Lucas Gass <lucas@bywatersolutions.com>
(cherry picked from commit e1caed6c63d9a831e332ccee32123a591ae2b7e1)
Signed-off-by: Arthur Suzuki <arthur.suzuki@biblibre.com>