Bug 38016: Rename booking circulation rules

Bug 38016: Rename booking circulation rules

This enhancement renames the bookings circulation rules to better describe what they do.

To test:

1. Go to Koha Administration -> Circulation and fines rules
2. Scroll to the 'Default holds and bookings policies by item type' section
3. Notice the bookings rules in this table:
  - Booking preparation period
  - Booking precaution period
4. Apply the patch and refresh the page
5. Confirm the bookings have been renamed to:
  - Booking pre-processing (days)
  - Booking post-processing (days)
6. Confirm these names make sense and it is clear what the rules are used for and how they are applied
7. Put values in the input fields for these rules and confirm saving a rule works as expected

Sponsored-by: Catalyst IT
Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Kyle M Hall <kyle@bywatersolutions.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>