Hello,
You need to install Loco Translate plugin, then you will be able to create translations for the theme and XStore Core plugin https://xstore.helpscoutdocs.com/article/30-base-theme-translation If you face any problems with the translation, please describe in more detail with screenshots + provide temporary wp-admin access.
Lightshot Screenshot tool https://app.prntscr.com/en/index.html makes screenshots and generates links then you can provide links of screenshots here.
Do you mean our free theme – XClean? Here can find xml file to import demo content – https://dropmefiles.com/Ba9G8
Regards