Hello,
Translate XStore theme and XStore core plugin, not child theme! https://xstore.helpscoutdocs.com/article/30-base-theme-translation
Choose the location of your translation to System. Don’t choose Author because you’ll lose it after theme or plugin update.
2) Enable Elementor for the Static blocks and products in the Elementor settings https://xstore.helpscoutdocs.com/article/47-static-blocks
After that edit Static blocks using Elementor and also Product description using Elementor.
Regards