Hello, Hedo,
Thank you for reaching out to us.
1/ To translate the XStore theme and the XStore Core plugin, please refer to the following article: https://www.8theme.com/documentation/xstore/theme-translation/base-theme-translation/
2/ Edit cart and checkout pages using Elementor and change some texts there – https://prnt.sc/Q6pZfP-HobuM
Best Regards,
8Theme’s Team