Hello,
Go to Loco Translate > Plugins > Translate XStore Core plugin https://xstore.helpscoutdocs.com/article/30-base-theme-translation
Be sure that you don’t choose the Author directory while creating your translation because you will lose it after the theme update.
Let me know if you translate all the mentioned strings in the plugin translation files but still have questions. Provide WP Dashboard access in that case.
Regards