[DSC-1093] Added detect duplication label

Author: Luca Giamminonni

src/assets/i18n/en.json5

@@ -1927,6 +1927,8 @@
 
   "error.validation.notRepeatable": "This field is not repeatable, please choose only one value and discard the others.",
 
+  "error.validation.detect-duplicate": "The handling of the detected duplicates is mandatory",
+
   "event.listelement.badge" : "Event",
 
   "explore.browse-section.title" : "Browse",