can someone explain $body_code?

[mzimmers]

All files that create language-specific content are in the /languages/ folder. The ones for your specific template will be in template subfolders under this section.

OK, so...if I'm not interested in supporting other languages on this site, does this mean that I should copy this file into the template area before modifying it?

Or, has the template's author already stipulated where this file lives as a part of her design?