You should never delete the Define statements because Zen needs them to operate properly. It shows the long bit of text now because it cannot fine what it is looking for.
Instead put back the line you deleted and just delete the text inside the SALES MESSAGE GOES HERE so it just leaves the ''
define('HEADER_SALES_TEXT', '<h1>Sales Message Goes Here</h1>');
becomes:
define('HEADER_SALES_TEXT', '');



