Why is there not a reference to the hosted jQuery Validation Plugin anywhere?
Can somewhere share the Google Code link?
There is no "official" plugin for validation.
To my knowledge, Google doesn't host that plugin (assuming you're referring to this one).
Although that page does provide a list of links to Microsoft CDN for hotlinking.
Here they are:
It even has the localization files, e.g. Russia is http://ajax.aspnetcdn.com/ajax/jquery.validate/1.9/localization/messages_ru.js.