If WooCommerce Multilingual is activated, there is no way to translate WPML default way(switch languages on product edit page). With WooCommerce Multilingual plugin I have to go to Woocommerce->WooCommerce Multilingual->Products Tab to translate product and there the Original product language is already set. Here is the image https://we.tl/KdTtMe12uw .
Theme is fine because I changed it to different and the problem was still there.
