I have a feeling I'm the last one in the world to find this out, but according to GraphJam, you can use Google Translate for beatboxing. Try it by using their example, or hit this link (may or may not work depending on your location). The fact that they detect beatbox-like input and replace the "Listen" button with a "beatbox" one is pretty awesome.
Yeah a little late on the pick up for this, but it's ok. And further trivia on the matter is that the beatbox button wasn't added until the original story/video went viral-ish regarding being able to do it in the first place. However, Google did get that put in place rather rapidly so they're obviously staying on top of how this whole "internet" thing is working :)