Yesterday I have obtained the "vote down" privilege. Some days ago I have obtained this privilege in other site of StackExchange, too.
But today I see this. The URL is correct and send to here, but... what's happened?
Internationalization seems to be the Vietnam of Stack Exchange Network.
A fix has been pushed out and we've even improved the tools a bit, so hopefully this won't happen again*.
* I'm not betting on that, though :)