Change Text on Button

/* Change Text on Button */
add_filter( 'add_to_cart_text', 'woo_custom_single_add_to_cart_text' );   // < 2.1
add_filter( 'woocommerce_product_single_add_to_cart_text', 'woo_custom_single_add_to_cart_text' );  // 2.1 +

function woo_custom_single_add_to_cart_text() {

    return __( 'Kurs buchen', 'woocommerce' );

}
/* Change Text on Button ENDE */