TOPIC: Language file for User Panel

When someone tries to access the User Panel before registering or logging in, this text is displayed: You are not authorized to view this page.

I edited the front-end language file en-GB.com_dtregister and changed the line DT_NOT_AUTHORIZE= to the text I want displayed in that circumstance. I uploaded the language file to language>en-GB but the old text is still displayed.

I know I am changing the right file and uploading to the right location because I made another change to the language file and do see it in the front end.

Thanks in advance.