Add 3 -> III, 4 -> IV definitions

Author: DarkFenX

service/jargon/defaults.yaml

@@ -13,6 +13,12 @@ t2:
 2:
   - '2'
   - ' II$'
+3:
+  - '3'
+  - ' III$'
+4:
+  - '4'
+  - ' IV$'
 mk:
   - 'mk'
   - 'mark'