refs https://github.com/TryGhost/Ghost/issues/15502
- the amazing `i18next-parser` dependency will extract our translated
strings from Portal and dump them into locale files, so we never have
to add them manually
refs https://github.com/TryGhost/Ghost/issues/15502
- plain JSON files are cleaner and less overwhelming than boilerplate JS
files, and given they're going to be automatically generated, we
probably won't be able to support comments anyway
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 :)
