The ScandiPWA theme is built on create-scandipwa-app, which implements a plugin mechanism, enabling you to create reusable extensions for the ScandiPWA theme. This means that you can create an extension once, and use it on multiple of your projects, or even sell it or share it for use by others.
You can add the additional translations in the
i18n directory. All internationalization files are merged to produce the translations, so this will update the translations for extensions as well. Theme translations are prioritized over extension translations, so you can override existing translations as well.