Rename Woocommerce message, button

functions.php

function my_text_strings( $translated_text, $text, $domain ) {
    switch ( $translated_text ) {
        case 'Billing details' :
            $translated_text = __( 'Faktureringsdetaljer', 'woocommerce' );
            break;
        case 'Your order' :
            $translated_text = __( 'Din bestilling', 'woocommerce' );
            break;
        case 'View cart' :
            $translated_text = __( 'Se indkøbsvogn', 'woocommerce' );
            break;
        case 'Apply coupon' :
            $translated_text = __( 'Anvend kupon', 'woocommerce' );
            break;
        case 'Update cart' :
            $translated_text = __( 'Opdater indkøbsvogn', 'woocommerce' );
            break;
        case 'Proceed to checkout' :
            $translated_text = __( 'Gå til kassen', 'woocommerce' );
            break;
        case 'Cart totals' :
            $translated_text = __( 'Indkøbskurv totaler', 'woocommerce' );
            break;
        case 'Place order' :
            $translated_text = __( 'Angiv bestilling', 'woocommerce' );
            break;
        case 'Calculate shipping' :
            $translated_text = __( 'Beregn fragt', 'woocommerce' );
            break;
        case 'Price' :
            $translated_text = __( 'Pris', 'woocommerce' );
            break;
        case 'Product' :
            $translated_text = __( 'Produkt', 'woocommerce' );
            break;
        case 'Quantity' :
            $translated_text = __( 'Antal', 'woocommerce' );
            break;
        case 'Shipping' :
            $translated_text = __( 'Forsendelse', 'woocommerce' );
            break;
        case 'Return to shop' :
            $translated_text = __( 'Tilbage til butikken', 'woocommerce' );
            break;
        case 'Coupon code' :
            $translated_text = __( 'Kuponkode', 'woocommerce' );
            break;
        case 'Ship to a different address' :
            $translated_text = __( 'Send til en anden adresse', 'woocommerce' );
            break;
    }
    return $translated_text;
}
add_filter( 'gettext', 'my_text_strings', 20, 3 );