Login page not found

Hi,

I have installed this plugin but I have found a problem when I enable “Hide backend” option. When I try to access to the customed login page it shows the message “404 Not Found”.
This seems to be related to another plugin I use to translate my page to different languages.
Por example, if my custom backend URL is http://www.mypage.com/customlogin when I wrote it in the browser the translator plugin redirects to http://www.mypage.com/en/customlogin
Is there any way to add the language url (/en/) to the customed backend URL?

Thanks in advance!
Regards