[DSC-1498] configured label for Sherpa Romeo source in authority dropdown

Author: steph-ieffam

src/assets/i18n/en.json5

@@ -2481,7 +2481,7 @@
 
   "form.entry.source.zdb": "",
 
-  "form.entry.source.sherpa": "",
+  "form.entry.source.sherpa": "- Sherpa Romeo",
 
   "form.remove": "Remove",