Hello, @SC,
1. You have to change/translate the word SALE from XStore >> Theme Settings >> WooCommerce >> Shop Elements >> Sale & Out of Stock & New as per your requirements: https://postimg.cc/Z9vwwHPc & https://postimg.cc/N9wZTZhT
2. You gave to change/translate the word Categories from XStore >> Theme Settings >> Header Builder and edit the Mobile Menu element/item and change the title as per your requirements: https://postimg.cc/JGv806h3 & https://postimg.cc/r03jxrRH
Regards 8Themes Team.