Hello,
Our theme already has some translations, so you can use them. For example https://www.8theme.com/glotpress/projects/xstore/xstore-theme/fr/french/ and https://www.8theme.com/glotpress/projects/xstore/xstore-core-plugin/fr/french/
I have uploaded these translations for you. Let me know if you still have any untranslated strings.
Regards