Add Jazz dependency.
Add Linguist dependency.
Alias Potion.Internationalization to Linguist.Vocabulary.
Add Potion.Exception protocol.
Use Potion.Except for Potion.Config.UndefinedError.
Fix unused warnings.
Make Potion.Internationalization.Provider use Linguist.Vocabulary instead of aliasing it.

It would have been too easy otherwise, wouldn't it?
Fix locale file paths in internationalization template.
Hack around Elixir's bullshit with aliasing.