Internationalization
We need to set up internationalization for our projects. It's quite a complex task, so we will hold it until the refactors are made.

TODO:

- [ ] Make all strings localizable, set up i18n for admin and store
- [x] Set up an localization platform to make everyone able to contribute translations
- [x] Website translated
- [ ] Ideally: translate admin UI, checkout page, store and everything that is translatable