Fixes grammar of notification "Email was send!"

(cherry picked from commit 2c57e77183)

dmp-frontend/src/assets/i18n/en.json

@@ -185,7 +185,7 @@
 		"REQUEST-EMAIL-HEADER": "We are almost done! Please fill your e-mail.",
 		"REQUEST-EMAIL-TEXT": "You will need to confirm it to use the application.",
 		"SUBMIT": "Submit",
-		"SENT-EMAIL-HEADER": "Email was send!",
+		"SENT-EMAIL-HEADER": "An email has been sent! Please check your inbox.",
 		"EMAIL-FOUND": "Email is already confirmed"
 	},
 	"HOME": {
@@ -1535,4 +1535,4 @@
 		"DRAFT": "Draft",
 		"FINALIZED": "Finalized"
 	}
-}
+}