Hello,
1) Sync translation of the theme – https://xstore.helpscoutdocs.com/article/103-translation-files-update , then try to find this text.
Or provide us with temporary wp-admin access.
2) Sorry, but your request is a bit unclear to me. Please describe the desired result in more detail.
3) Check translation of XStore Core plugin.
4) Re-upload the logo image via Theme Options.
Regards