In the file includes/languages/english/modules/payment/moneyorder.php

Line 22 or so: : define('MODULE_PAYMENT_MONEYORDER_TEXT_TITLE', 'Check/Money Order');
And

includes/modules/payment/moneyorder.php

Line 100 or so: : $db->Execute("insert into " . TABLE_CONFIGURATION . " (configuration_title, configuration_key, configuration_value, configuration_description, configuration_group_id, sort_order, set_function, date_added) values ('Enable Check/Money Order Module', 'MODULE_PAYMENT_MONEYORDER_STATUS', 'True', 'Do you want to accept Check/Money Order payments?', '6', '1', 'zen_cfg_select_option(array(\'True\', \'False\'), ', now());");