Apply Language Translation (Kinda) for MarketPress

I'm using typekit for button fonts on my site but the particular font I'm using doesn't have the >> character code &raquo. Since there is no filter for buttons like .mp_direct_checkout_link I want to use the mp-default.po file to convert the Checkout Now &raquo text to just Checkout Now. I tried changing the mp-default.po file but it doesn't seem to effect the output. Thanks for the help.