Thanks to Cedric, for sending me on a short search for translation links. Google’s embedded script tool for translation is, of course, off limits on WordPress.com, like so many other useful and interesting gadgets.
On the other hand, there is a page that describes how to hard-link the sidebar widgets into Google’s translators. If you want to translate out of another language, you’ll want to search-and-replace through the links that are listed there. A little more HTML and you get something like what you see on the right.
No, it’s not technically a widget, but so long as strict HTML is still kosher, I suppose it’ll do. Enjoy.
P.S.: I don’t endorse or suggest relying on mechanical translations, in the case that you’re following instructions on how to set something up. Occasionally even the best translations are a bit … askew.