DSC-1498: update source labels

Author: FrancescoMolinaro

src/assets/i18n/en.json5

@@ -2477,6 +2477,14 @@
 
   "form.entry.source.orcid": "- Orcid",
 
+  "form.entry.source.ror": "- ROR",
+
+  "form.entry.source.openaire": "- OpenAIRE",
+
+  "form.entry.source.zdb": "- ZDB",
+
+  "form.entry.source.sherpa": "- Sherpa",
+
   "form.remove": "Remove",
 
   "form.save": "Save",