Added Korean translations for JQuery validate plugin

This is a Korean localization file for the jquery.validate plugin. We're using it for our local site, so I figured I'd share it with the community.

Not sure if I need to include tests to submit a PR for this? I didn't see any in the /spec directory for the other localizations to use as a reference, so I'm just submitting it as is. Let me know if you need anything else.