Internationalization Module

[hhenrichsen]

Basically, we don't want to allow sending messages without sending them through an i18n layer. Ideally we can send this through Adventure and some placeholder plugin as well before it gets to the user, but that's largely an implementation detail on the software adapter end.

We'll need:

• A "good enough" set of Pluralization Rules
• A system that can pluralize messages based on a count parameter
• A system that can send messages replacing placeholders as needed
• A system that can pull arbitrary i18n strings from a file

Depends on #4.