eKashi on "[Plugin: WooCommerce - excelling eCommerce] Woocommerce Order Status translate"

I am just finishing my web on localhost, but I'm having a problem with woocommerce order statuses. My handcraft store customers and sellers could be elders and they don't know English, how can I translate or change words? in which file?
on-hold
pending
processing
cancelled
refunded
etc?
please help me.

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