How do I change the language (words) in the Global Post or Activity Feed?

When you use one of the Recent Sitewide Posts widgets, when a new item is displayed is says: "(username) wrote a new post".

I would like to change the "wrote a new post" part to something else.
I have crawled through the plug in, and theme files and have determined that this is a Buddypress function...so...does anyone know which file I need to edit to change the wording in that phrase?