Hello,
If you want to translte whole site just to 1 another language you need to go to Settinsg > General > choose the necessary language in the Languages list and save settings. After that translate theme and XStore core plugin https://www.8theme.com/documentation/xstore/theme-translation/base-theme-translation/
If you want to create the multilanguage site you need a special plugin for these purposes https://colorlib.com/wp/wordpress-multilingual-plugins/
Regards