When a booking is cancelled, patron received an email based on specific
letter.
Test plan:
1) Create a letter with code "BOOKING_CANCELLATION" on "Notices and
slips" tool.
2) Add booking or go on item already booked in advance.
3) Cancel it
4) Verify in message_queue table directly or go on patron page and click
on "Notices" tab section.
Sponsored by: Association de Gestion des Œuvres Sociales d'Inria (AGOS)
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
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