For some reason I can't make changes to the tagline in my header. I've read through the tutorial about a dozen times but I must still be doing something wrong. I copied the header.php file from the /languages/english/ folder to the corresponding template folder.

The home page is www.vinylspiral.com
The tagline should read "this is my super tagline" but it does not.

Developer tools confirms that

/includes/languages/spiral/header.php

Line #21 : define('HEADER_SALES_TEXT', 'this is my new SUPER TAG LINE');

...?
If someone can tell me what I might be doing wrong it would save me a load of stress.

thanks!