Bug 26007: Add/fix warning for changes to the Koha to MARC mappings

Bug 26007: Add/fix warning for changes to the Koha to MARC mappings

There are 2 pages where one can change the Koha to MARC mappings in Koha:

- When editing the configuration for a MARC subfield
- On administration > Koha 2 MARC mappings

This patch adds a warning that the batchRebuildBiblioTables script
must be run if the mapping is changed.

To test:
- Go to Administration > MARC bibliographic frameworks >
  Any framework > MARC structure > Any field > Edit subfield
- ÃThe hint about the batchRebuildBiblioTables will be on "Link"
  instead of "Koha Link". This is wrong as the link doesn't care
  about the mappings.
- Go to Administration > Koha to MARC mappings
- Verify there is no hint
- Apply patch
- Verify both pages now show an appropriate message

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
This commit message is not completely accurate. See the follow-ups.

Signed-off-by: Jonathan Druart <jonathan.druart@bugs.koha-community.org>