A little older but not dated is https://github.com/softwarerero/meteor-accounts-t9n that started as a translation of the meteor basic packages and it is easy to add translations for an application. Currently it comes with 24 translations of standard meteor packages. We have not implemente international date and calendar support so it is not a real i18n solution, just translation. But it works in many production projects, which answers the original question indirectly.