admin/includes/languages/english/orders.php
Code:
define('EMAIL_SEPARATOR', '------------------------------------------------------');
define('EMAIL_TEXT_SUBJECT', 'Order Update');
define('EMAIL_TEXT_ORDER_NUMBER', 'Order Number:');
define('EMAIL_TEXT_INVOICE_URL', 'Detailed Invoice:');
define('EMAIL_TEXT_DATE_ORDERED', 'Date Ordered:');
define('EMAIL_TEXT_COMMENTS_UPDATE', '<em>The comments for your order are: </em>');
define('EMAIL_TEXT_STATUS_UPDATED', 'Your order has been updated to the following status:' . "\n");
define('EMAIL_TEXT_STATUS_LABEL', '<strong>New status:</strong> %s' . "\n\n");
define('EMAIL_TEXT_STATUS_PLEASE_REPLY', 'Please reply to this email if you have any questions.' . "\n");
spanish translation (if there is one) would be at admin/includes/languages/spanish/orders.php