How to translate new strings after theme update
After theme update new strings may be added to default jupiterx.pot file, but you can’t find them in your translation .po file.
To fix it, you need synchronize your file with the default one. To update your .po file, navigate to Catalog, choose Update from POT file, and then choose the jupiterx.potfile from which you will get the updated contents. After that, translate the project as you normally do and save all changes.