src/assets/i18n: fix English permission string

The current message is not correct English. Note, there seems to be
a mix of "don't" and "do not" language. Perhaps we should harmonize
that eventually.

Author: alanorth

src/assets/i18n/en.json5

@@ -4061,7 +4061,7 @@
 
   "submission.general.cancel": "Cancel",
 
-  "submission.general.cannot_submit": "You have not the privilege to make a new submission.",
+  "submission.general.cannot_submit": "You don't have permission to make a new submission.",
 
   "submission.general.deposit": "Deposit",