Bug 34677: Update to MARC21 relator terms list (Feb 21, 2014 technical notice)

This patch adds missing relator codes/terms to the marc21_relatorterms.yaml file in accordance with the February 21, 2014 technical notice.

https://www.loc.gov/marc/relators/tn140221rel.html

To test:
1. Apply patch and restart
2. Go to Administration > Authorized values > RELTERMS
   --> New terms should be there and modified terms should be changed

Additions:
dgs - Degree supervisor
med - Medium
mtk - Minute taker
vac - Voice actor
wst - Writer of supplementary textual content
win - Writer of introduction
wpr - Writer of preface

Changes:
orm - Organizer

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>

installer/data/mysql/en/optional/marc21_relatorterms.yml

@@ -358,6 +358,10 @@ tables:
           authorised_value: "dgg"
           lib: "Degree grantor"
 
+        - category: "RELTERMS"
+          authorised_value: "dgs"
+          lib: "Degree supervisor"
+
         - category: "RELTERMS"
           authorised_value: "dis"
           lib: "Dissertant"
@@ -642,6 +646,10 @@ tables:
           authorised_value: "mcp"
           lib: "Music copyist"
 
+        - category: "RELTERMS"
+          authorised_value: "med"
+          lib: "Medium"
+
         - category: "RELTERMS"
           authorised_value: "mfp"
           lib: "Manufacture place"
@@ -678,6 +686,10 @@ tables:
           authorised_value: "mte"
           lib: "Metal-engraver"
 
+        - category: "RELTERMS"
+          authorised_value: "mtk"
+          lib: "Minute taker"
+
         - category: "RELTERMS"
           authorised_value: "mus"
           lib: "Musician"
@@ -696,7 +708,7 @@ tables:
 
         - category: "RELTERMS"
           authorised_value: "orm"
-          lib: "Organizer of meeting"
+          lib: "Organizer"
 
         - category: "RELTERMS"
           authorised_value: "osp"
@@ -1030,6 +1042,10 @@ tables:
           authorised_value: "uvp"
           lib: "University place"
 
+        - category: "RELTERMS"
+          authorised_value: "vac"
+          lib: "Voice actor"
+
         - category: "RELTERMS"
           authorised_value: "vdg"
           lib: "Videographer"
@@ -1058,6 +1074,18 @@ tables:
           authorised_value: "wde"
           lib: "Wood-engraver"
 
+        - category: "RELTERMS"
+          authorised_value: "win"
+          lib: "Writer of introduction"
+
         - category: "RELTERMS"
           authorised_value: "wit"
           lib: "Witness"
+
+        - category: "RELTERMS"
+          authorised_value: "wpr"
+          lib: "Writer of preface"
+
+        - category: "RELTERMS"
+          authorised_value: "wst"
+          lib: "Writer of supplementary textual content"