Hello,
Please check this article – https://www.8theme.com/documentation/xstore/theme-translation/ Translation files of the theme should be placed into /wp-content/languages/themes/ folder, with correct names – https://prnt.sc/usvesj Once you placed current files to the mentioned folder, click on Sync https://www.8theme.com/documentation/xstore/theme-translation/translation-files-update/ and continue translation.
Just close this message – https://prnt.sc/usvgcu WordPress copies translation files back after the update, so you won’t lose them. Anyway always do the backup of your files and DB before WP update.
Regards
