how do i alter this text...

i have set the arcade to not be viewed by unregistered users and i want to have the message say something different then it says. how do i alter the this:

The administrator has disabled viewing of the arcade for your member group. If you feel this is a mistake please PM an administrator and let them know.

thanks.

[WEBDosser]

in arcade lang -- lang_Arcade_en.php

[GoTTi]

thanks

[WEBDosser]

no problems

[Jase2]

MrZeropage, please make a custom text box for offline message definable in ACP