Hello Mauro,
First of all, thank you for using XStore and for contacting us. Follow this article to translate the theme https://xstore.helpscoutdocs.com/article/30-base-theme-translation , do not forget about translation for plugins, here is article for WooCommerce – https://docs.woocommerce.com/document/woocommerce-localization/
The desired currency you can set in Dashboard > WooCommerce > Settings > General tab > Currency options
Regards
