It's not quite that simple. It's a common misconception that a file needs to be edited in order to make something work. Yes, the stylesheet controls some layout but it doesn't by design turn things on and off.
Neither is heading to a file and changing code generally a wise choice.
Most items are changed in the Admin portion of the cart. There are some blurred areas between the admin and the stylesheet but, normally, editing code in a file should be a last resort. Note that deleting the Congratulations, etc listings in the english.php is not editing code but deleting or adding text to a variable. Just as if you were using the define pages editor.
A bit long-winded but it is a common mistake among both the geeks and non-geeks. Seems the ones who code don't want to take the time to look as they know "I can code it quicker." Newbies don't know some of the terminology that would help them look and make stabs at changing code.
It looks as if someone has attempted to get rid of the ezpages header bar through coding versus the EZ-Pages Settings in the admin.
First go to your admin and turn off the HeaderBar for EZ-Pages (make it 0 versus 1) If that gets rid of the code, we can move on from there.