Change some Words on Woocommerce

This is my site http://www.Yunachicsk.com
and im using WooCommerce Plugin

And see this page http://www.yunachicks.com/shop/atasan/blazer-flowy-vintage/
how to change the language/word from “Add to Cart” (on the button) to “Beli”

Thanks before

[mod: removed redundant [HELP] from topic title]

[Closed per multiple duplicate threads http://wordpress.org/support/topic/help-change-some-words-on-woocommerce-2?replies=2#post-3779732 ]