fix: fix bugs and structure

src/i18n/en/submissions.json

@@ -12,6 +12,7 @@
     "emptyNumericValue": "A numeric value should be provided as answer.",
     "numericValueRange": "Numeric value is out of specified range.",
     "emptyChoiceId": "Choice Id should be provided as answer.",
-    "transitionNotFound": "No transition found for the test"
+    "transitionNotFound": "No transition found for the test",
+    "uniqueSubmissionQuestion": "Question's Answer already exists."
   }
 }