Change Text on Order Received page in WooCommerce

woocommerce-change-order-received-text.php

<?php

add_filter('woocommerce_thankyou_order_received_text', 'woo_change_order_received_text', 10, 2 );
function woo_change_order_received_text( $str, $order ) {
    $new_str = $str . ' We have emailed the purchase receipt to you.';
    return $new_str;
}

Hey, should I add this piece of code to the thankyou.php file or should I create a new file named woocommerce-change-order-received-text.php? What do I need to do to ensure the text is changes and displayed correctly at checkout page? Thank you

I somehow cannot translate this part. I used loco translate and it did work magic but this part somehow cannot be translated :(

@truexPoland the snippet should have gone in your functions.php inside your theme (or better - a child theme)

@truexPoland You need to copy this code in the functions.php of your child theme. Are you saying you are unable to translate the message?