I am using Woocommerce V2.1.2 in Latest version of wordpress. I have googled, they have given a solution to change in frontend. But I need to change from backend.
K
add_filter( 'add_to_cart_text', 'woo_custom_cart_button_text' );
add_filter( 'woocommerce_product_add_to_cart_text', 'woo_custom_cart_button_text' );
add_filter('woocommerce_product_single_add_to_cart_text', 'woo_custom_cart_button_text');
function woo_custom_cart_button_text() {
return __( 'Buy Now', 'woocommerce' );
}