Change text in registration and order confirmation e-mails

[Guest]

I need to change the text that appears in the e-mail customers get when they register on my site as well as the order confirmation e-mail. Can some one point me in the right direction to find that (or those) files? I thought it would be in includes/languages/english somewhere. But, as of yet, I can't find it.

 

Thanks!

[multimixer]

In the language folder the files

checkout_process.php

create_account.php