If you update the theme you will also need to update theme translation to keep it up to date and avoid problems with untranslated strings.
Update translation using poEdit #
Open .po file and press Catalog > Update from POT file
Choose the pot file that is located in xstore/languages/ folder on your site.
Save changes and re-upload translation files to your site.
Update translation using Loco Translate plugin #
Edit translation and press the Sync button
Save translation.
