Hello,
https://www.8theme.com/documentation/xstore/theme-translation/base-theme-translation/
Related posts, Continue reading, Leave a reply, Comment – should be available for translation for XStore theme. Follow this article https://www.8theme.com/documentation/xstore/theme-translation/translation-files-update/ to update the translation files.
About images of related posts, try to disable all the third-party plugins, and check how images load then.
Regards