Warning: Product properties should not be accessed directly.

In falang/src/Falang/Filter/Site/WooCommerce.php, translate_wc_product_title produces warnings because of $product->ID = $product->id; on line 191.

Rewrite of translate_wc_product_title to fix it:

public function translate_wc_product_title($title, $product){
        if (!Falang()->is_default()) {
            $falang_post = new \Falang\Core\Post();
            $post = get_post($product->get_id());
            $translated_product_title = $falang_post->translate_post_field($post, 'post_title', Falang()->get_current_language(), $title);
            return $translated_product_title;

        }
        return $title;
    }