While looking over the patch notes for Minecraft 1.2.4, I noticed a section under the known bugs labelled "Translation Related". There, in addition to a lot of notes about Spanish translations that mostly seemed to involve correcting names (including some interesting juggling of the terms castellano and español that might be deserving of its own post), I found this curious and rather amusing line:
The translation [Quenya (Arda)] has "Lever" labeled as "Mechanic Pen*s"
A quick check reveals that Minecraft is actually available in three constructed languages: Esperanto [listed as "Esperanto (Mondo)"], Quenya ["Quenya (Arda)"], Klingon ["tlhIngan Hol (US)"] ... Why Klingon's listing is US and not some term for the Klingon Empire or their homeworld Kronos/Qo'noS I wouldn't know.
The trivia on Minepedia's Language* page does not redact the term, so I presume that some joker did indeed name the Lever element "Mechanical Penis" (Minecraft uses a crowdsourcing site for translations, and it has gotten them in bigger trouble than this.), however, the problem was apparently fixed, as when I jumped in the game using the Quenya UI and made a lever, the mouseover text read "Turolwen" as shown in the image below.
I can't vouch for the accuracy of any of these translations of course, though the Quenya is obviously incomplete, as a few English words and phrases are still being used. Of course, I'm sure that many of the words Minecraft needs would not be in any canonical Tolkien source, and I think the Elven language people tend to be a little touchy about coinages -- it's just one of the things that can get them arguing.
In any case, it's cool to see people having fun with some conlangs. In addition to the proper conlangs listed above, there is also a hilarious joke language called Pirate English in the options, and it's pretty much exactly what you would expect it to be. And of course, there are a wide array of natural languages, too, which will of couse benefit Minecraft a bit more.
*Which, as I write this, does not list Esperanto, though I'm sure that will be corrected.