update aria label of the character count toggle (#10915)

apps/web/src/locales/en/messages.json

@@ -71,7 +71,7 @@
   },
   "itemHistory": {
     "message": "Item history"
-  },  
+  },
   "authenticatorKey": {
     "message": "Authenticator key"
   },
@@ -9050,8 +9050,11 @@
     "message": "Public API",
     "description": "The text, 'API', is an acronymn and should not be translated."
   },
-  "additionalContentAvailable": {
-    "message": "Additional content is available"
+  "showCharacterCount": {
+    "message": "Show character count"
+  },
+  "hideCharacterCount": {
+    "message": "Hide character count"
   },
   "editAccess": {
     "message": "Edit access"