woothemes/woocommerce — pull request #2552 by thenbrent (2013-03-01 04:56:14+00:00)
Title: Use handler for add-to-cart button text also

Use the add to cart handler filter introduced with SHA: bd78ca6 to also provide a way for extensions to use core WC add to cart button text (more details on original hook in #2539).

I've used the same hook name for both places, as they're closely related.