Fix @ prefixing domain rewrite and update localization

data/web/lang/lang.ko-kr.json

@@ -673,9 +673,9 @@
         "recipient_map": "Recipient map",
         "recipient_map_info": "Recipient maps are used to replace the destination address on a message before it is delivered.",
         "recipient_map_new": "New recipient",
-        "recipient_map_new_info": "Recipient map destination must be a valid email address.",
+        "recipient_map_new_info": "Recipient map destination must be a valid email addresses or a domain name.",
         "recipient_map_old": "Original recipient",
-        "recipient_map_old_info": "A recipient maps original destination must be valid email addresses or a domain name.",
+        "recipient_map_old_info": "A recipient maps original destination must be a valid email addresses or a domain name.",
         "recipient_maps": "Recipient maps",
         "relay_all": "모든 수신자에게 릴레이",
         "remove": "Remove",
@@ -1018,4 +1018,4 @@
         "session_token": "Form token invalid: Token mismatch",
         "session_ua": "Form token invalid: User-Agent validation error"
     }
-}
+}