Bug 35813: Add success feedback after placing/editing bookings

Bug 35813: Add success feedback after placing/editing bookings

This patch restores the lost behaviour that a successful add/edit of a
booking via the 'Place booking' modal should notify the end user that
the submission was sucessful.

Test plan
1) Set an item as bookable to expose the 'Place booking' button
2) Place a new booking from the following pages and confirm that you
   now recieve feedback.
   * Catalog > Title > Details
   * Catalog > Title > MARC details
   * Catalog > Title > ISBD details
   * Catalog > Title > Item details
   * Catalog > Title > Bookings
3) Edit a booking on the 'Catalog > Title > Bookings' page and confirm
   you now recieve feedback.

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>