Changing the word 'SKU' in Woocommerce

Hello,
I’m trying to change the word “SKU” in woocommerce to something like “BY” or “ARTIST”.
Does anyone know where this can be done?
Here is an example of what I mean: http://brokennoodle.com/shop/stucko-in-the-wild-edition/
Any help would be appreciated.
Thanks much!

http://wordpress.org/extend/plugins/woocommerce/