Hello,
Thank you so much for purchasing our theme and contacting our support center.
1/ Please check the translation of XStore Core plugin.
2/ Check translation of the theme
3/ Default WooCommerce widget Products categories, so check translation of WooCommerce.
Also, go to Theme Options > General > Enable Classic Widgets Panel > On. Then go to Appearance > Widgets > Shop page sidebar > make sure the widget is added to the sidebar and edit the title of the categories widget.
Regards