Bug 34677: (follow-up) Additional updates to match the LOC list

Bug 34677: (follow-up) Additional updates to match the LOC list

This patch makes additional updates to the RELTERMS authorized
value list to make it match the MARC Code List for Relators
at https://www.loc.gov/marc/relators/relaterm.html and
https://www.loc.gov/marc/relators/relacode.html

It also updates the description displayed in the
authorized values list.

Test plan:
1. Apply the patch.
2. Reload the values (reset_all if using KTD).
3. Go to Administration > Authorized values.
4. Note that the description for RELTERMS is changed
   (now says 'MARC Code List for Relators
    (https://www.loc.gov/marc/relators/).' instead of
    'French terms of relations').
5. Check that the changes listed are incorporated
   into the RELTERMS authorized values list.

Additions:
prv - Provider
rcd - Recordist
stg - Setting

Changes:
aui - Author of introduction -> Author of introduction, etc.
aus - Author of screenplay -> Screenwriter
coe - Contestant -appellee -> Contestant-appellee
cot - Contestant -appellant -> Contestant-appellant
cou - Court-governed -> Court governed
dpb -> dbp - Distribution place
dgg - Degree grantor -> Degree granting institution
osp - On-screen presenter -> Onscreen presenter
pte - Plaintiff -appellee -> Plaintiff-appellee
rcp - Recipient -> Addressee
red - Redactor -> Redaktor
wde - Wood-engraver -> Wood engraver

Removals:
-grt - Graphic technician

Signed-off-by: David Nind <david@davidnind.com>
Signed-off-by: Katrin Fischer <katrin.fischer@bsz-bw.de>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>