Hello Ilson Mateus,
First of all, thank you for using XStore and for contacting us.
Please follow documentation – https://xstore.helpscoutdocs.com/category/18-theme-translation
Use Loco Translate plugin to create translations for XStore theme and XStore Core plugin.
Strings of this form http://prntscr.com/s92pvy come from Core, so go to Loco translate > Plugins > XStore Core > New language > Choose a language + Choose a location – System > Start translating.
Regards