Change visiting error message..

Anyone knows where I can change the error messages?

"Sorry, an error occured...." and
"The administrator has disabled playing games for you..."

This is error message a visiting non-registered person get to the board but from the messsage it looks more if the games aren't functioning. I want to change it to something stating that they need to register before playing...

Thanks

[MrZeropage]

check the language-file
/arcade/lang/

[powerbook]

As they say, Thank you for the directon. Much appreciated..