Set Up 2 Language Override for Empty Cart

Hello,

When come to checkout, if buyer delete the item in the cart, it will show up a message eg. "The cart is empty". This is as same as cart module setting from language override.

So if your cart module is display as "Your Cart is Empty (0)", the message appear on checkout page after buyer deleted the item will also show as "Your Cart is Empty (0)".

Now can I format them into 2 versions of language override?
eg. Cart module : "Your Cart is Empty (0)"
Message in checkout page: "Your cart is empty, continue shopping now!"

Where can I find the code to edit the 2nd one without changing the 1st one?