[Feature] Internationalization of the bot

[stephenyeargin]

(This is related to #55 so folks don't have to fork the main repository to add language support.)

The i18n package would get the hard part done, and then it would be a matter of going through the app and finding the many places strings are built/returned and using the formatting methods.

Example: https://gist.github.com/mashpie/5188567