Bug 25011: Improve display of MARC21 508 - Production credits in staff and OPAC

Bug 25011: Improve display of MARC21 508 - Production credits in staff and OPAC

Makes some tiny changes to improve display and consistency between
OPAC and staff:
- Capitalization fix: Production Credits - Production credits
- Changes div to span avoiding display issues
- Make sequence of fields in display match (505, 508, 586)

To test:
- Catalog one or more records with none, one and multiple 508 $a
- Check and compare the staff and OPAC detail pages, both
  should display the production credits information correctly

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Marcel de Rooy <m.de.rooy@rijksmuseum.nl>
Signed-off-by: Martin Renvoize <martin.renvoize@ptfs-europe.com>