Hello,
You can upload partial translations if you find your language in the list of the available languages https://xstore.8theme.com/glotpress/projects/xstore-theme/ and https://xstore.8theme.com/glotpress/projects/xstore-core-plugin/ or create the new translation following the docs.
You won’t lose your translation after theme or plugin update if you place translation files either to custom or to system directory https://prnt.sc/2643itm Don’t place it to author directory because it will be removed after an update.
Regards
