Bug 37121: MARC21 Addition to relator terms in technical notice 2024-05-14

Bug 37121: MARC21 Addition to relator terms in technical notice 2024-05-14

This patch adds relator codes from the May 14, 2024 technical notice
(https://loc.gov/marc/relators/tn240514rel.html) to the list of MARC21 relator
terms in Koha.

To test:
1. Apply patch and reset_all
2. Go to Administration > Authorized values > RELTERMS
3. Search for the added relator codes

   - wfs - Writer of film story
   - wft - Writer of intertitles
   - wts - Writer of television story

Note: this is added in the installer files. It will not affect existing
installations. For existing installations, add the new relator codes in
Administration > Authorized values > RELTERMS.

Signed-off-by: Phil Ringnalda <phil@chetcolibrary.org>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>