add temporary email description

data/web/lang/lang.en-gb.json

@@ -1192,6 +1192,7 @@
         "created_on": "Created on",
         "daily": "Daily",
         "day": "day",
+        "description": "Description",
         "delete_ays": "Please confirm the deletion process.",
         "direct_aliases": "Direct alias addresses",
         "direct_aliases_desc": "Direct alias addresses are affected by spam filter and TLS policy settings.",
@@ -1338,4 +1339,4 @@
         "session_token": "Form token invalid: Token mismatch",
         "session_ua": "Form token invalid: User-Agent validation error"
     }
-}
+}