Menu problem – multisite

Hi. Help me please, I’v got a problem with multisite.

I use polish lang. I create multisite and woocommerence plugin. First I set polish language in dashboard settings both sides. Because second website has english contents – for english users, I want set in dashboard english as language of second webside… But when I do it, menus stoped working, and links from woocomerence products pages stopped working. So I must back to polish in dashboard and everything is O.K. Someone know why? How can I fixed it – I need english in second side to have english “More” in woocommerence buttons (when I use polish as side language, I have polish “Wi?cej” in buttons….

Regards, Kate