New translations irc.lang.json (Polish)

languages/pl-PL-irc.lang.json

   "No topic is set": "",
   "Not enough parameters": "",
   "Only channel founders can change registered channels": "",
+  "Only the channel founder can do this": "",
   "Oragono is released under the MIT license.": "",
   "Passphrase contains forbidden characters or is otherwise invalid": "",
   "Password changed": "",
   "You may not reregister": "",
   "You must be an oper on the channel to register it": "",
   "You must be registered to join that channel": "",
-  "You must be the channel founder to op": "",
   "You must connect with a TLS client certificate to use certfp": "",
   "You must specify an account": "",
   "You must wait an additional %v before making another request": "",