refs https://github.com/TryGhost/Ghost/issues/15502 - this adds support for namespaces to the i18n package so we can separate translations for different packages
refs https://github.com/TryGhost/Ghost/issues/15502 - this is an early implementation of an i18n provider by exporting an instance of `i18next` - there's a lot more to be done here but baby steps :)