How to add additional lines in customer's money order checkout confirmation email?

[Hizen]

I found for the check/money order payment, the checkout confirmation eamail to the customers will look like the photo I have attached. The payment details are all gathered together. I want to add additional lines before 'Mail your payment...' and between company address lines. I have tried to alter the code in includes\languages\english\modules\payment\moneyorder.php, but nothing happened whatever I do to it. Below is the current code in this file:

define('MODULE_PAYMENT_MONEYORDER_TEXT_TITLE', 'Check/Money Order');
define('MODULE_PAYMENT_MONEYORDER_TEXT_DESCRIPTION', 'Please make your check or money order payable to:<br />' . MODULE_PAYMENT_MONEYORDER_PAYTO . '<br /><br />Mail your payment to:<br />' . nl2br(STORE_NAME_ADDRESS) . '<br /><br />' . '/n Your order will not ship until we receive payment.');
define('MODULE_PAYMENT_MONEYORDER_TEXT_EMAIL_FOOTER', "Please make your check or money order payable to:" . "\n\n" . MODULE_PAYMENT_MONEYORDER_PAYTO . "\n\nMail your payment to:\n" . STORE_NAME_ADDRESS . "\n\n" . 'Your order will not ship until we receive payment.');
?>


Is this the right file to look at? What can I do to solve the problem. I have spent all day on this...any help will be very much appreciated.

Julia