Woocommerce with Ceceppa

I tried to use the multilingual plugin for Woocommerce from Ceceppa to have both Polish and English on teehonled.pl. It woudn’t work correctly so I uninstalled it. Now some of the store buttons are in English mixed with Polish. The good news is that I have a backup. I tried to reinstall the language folder of woocommerce (/domains/teehonled.pl/public_html/wp-content/plugins/woocommerce/i18n) from backup but it didn’t fix the problem. How do I rectify these buggs.