Translation problem in cart and checkout view

Hi,
I am using a block view of the cart and checkout page.
On both pages, the text “Includes X.XX € Tax” is displayed in the summary. The whole page is in Spanish. However, the word “tax” is displayed in my native language – Polish. I have already changed the browser language and the language in my profile in wp-admin. Still without any effect.
I can’t find it in Woocommerce language files.

I wrote the theme of the store on my own, and I’m sure the word is nowhere to be found in the theme.

How to change this text?