Order form with Woocommerce

Hello everybody,

I don’t know if I’m inn the good section but I don’t find another one.

here is my trouble :
I would like to change a message of the order form from woocommerce
the message I have is “Malheureusement nous ne livrons…” (You could translate it by “Unfortunetly we don’t ship…”)
The message I want to put is “For Shipping out of France contact us”
See image on the link :
Image

Does someone could tell me where I can find the file which control it ?

Thank you.

PS : Sorry for my english