WooCommerce - Custom "Add to cart" text

functions.php

function woocommerce_custom_product_add_to_cart_text( $text, $product ) {

    $product_type = $product->product_type;

    switch ( $product_type ) {

        case 'external':
            return __( 'Buy product', 'woocommerce' );

        break;
        case 'grouped':
            return __( 'View products', 'woocommerce' );

        break;
        case 'simple':
            return __( 'Add to cart', 'woocommerce' );

        break;
        case 'variable':
            return __( 'Select options', 'woocommerce' );

        break;
        default:
            return __( 'Read more', 'woocommerce' );

    }

}

add_filter( 'woocommerce_product_add_to_cart_text' , 'woocommerce_custom_product_add_to_cart_text', 20, 2 );

function woocommerce_custom_product_single_add_to_cart_text( $text, $product ) {
    return __( 'Add to cart', 'woocommerce' );
}

add_filter( 'woocommerce_product_single_add_to_cart_text' , 'woocommerce_custom_product_single_add_to_cart_text', 20, 2 );