Thinking about it, I think that the Méluzzine Key hasn't been translated, because the name of the key is Meluzin in the quest name and the quest text, making me think that the name of the item itself was forgotten. For a similar reason, I think

was also forgotten - it is referred to as LovelyWood BJ22a Authorization Form in the quest.
There are also a few other ones which confuse me. They are common enough that I would have thought they would have been noticed by now though, so if there is something I'm missing about these, tell me. They all contain words that don't seem English to me. I checked with Google too.

Gump?

Car-En-Sac?

Dragibus?
Half cocobats?
Cerisot marinated in beer. Cerisot?