woocommerce string translation group

Hello there,

I am having a small problem with translating my online shop. I am using WooCommerce plugin for that purpose. I have translated all the pages no problem.

I cannot, however, start to translate other parts of my shop such as “cart”, or “check-out”. I know it should be translatable from the PolyLang string translation tool. Unfortunately I cannot see WooCommerce in the list of strings. It has no dedicated group, like it is shown here:
https://polylang.pro/doc/translating-woocommerce-urls-and-strings/

WooCommerce 3.1.1
PolyLang 2.1.6

Please help…