Hello,
Please read in our documentation how to update theme via FTP https://xstore.helpscoutdocs.com/article/63-theme-update (auto-update is not available for now). Please read this article https://docs.woocommerce.com/document/woocommerce-localization/ WC takes language from General settings. Also, please see screenshot – http://prntscr.com/kwop53
Regards
