Unable to change the word “shipping”

I am using your plugin and its great, thanks… but I have one small issue.

I wanted to change the word “Shipping” to “Delivery” on the Basket and checkout and I managed to do this by adding this to the functons.php in my child theme:

add_filter(‘woocommerce_shipping_package_name’, ‘change_shipping_text_to_delivery’, 20, 3 );
function change_shipping_text_to_delivery( $sprintf, $i, $package ) {
$sprintf = sprintf( _nx( ‘Delivery’, ‘Delivery %d’, ( $i + 1 ), ‘delivery packages’, ‘woocommerce’ ), ( $i + 1 ) );
return $sprintf;
}

This seems to be the accepted method to change that word, however, when I activate your plugin, the word “Shipping” comes back and nothing I do will change it.
There is no English language file in the plugin to edit, so that wont work.
I had to finally edit the file called “cart-shipping.php” in your plugin folder > woocommerce > cart
The problem with this is that if I updated the plugin my edits will be overwritten.

I was hoping you might look at this and make the necessary updates so that the child theme functions.php edits will work and that I wont need to keep editing the plugin files directly.

Thanks