Bug 34679: Change description for RELTERMS authorized value category

Bug 34679: Change description for RELTERMS authorized value category

This patch changes the description of the RELTERMS authorized value
category to "List of relator codes and terms".

To test:
1. Apply patch
2. Go to Administration > Authorized values
3. Search for category RELTERMS
   --> The description should read "List of relator codes and terms"

Signed-off-by: Owen Leonard <oleonard@myacpl.org>
Signed-off-by: Emily Lamancusa <emily.lamancusa@montgomerycountymd.gov>
Signed-off-by: Tomas Cohen Arazi <tomascohen@theke.io>
(cherry picked from commit 8a45084b7f757e131f2cc1aa61b8bce16e0ea34c)
Signed-off-by: Fridolin Somers <fridolin.somers@biblibre.com>