I haven't SEEN any, but I've listened to a bunch of cast albums in different languages:
1) My Fair Lady -- German
2) My Fair Lady -- Hebrew
3) POTO -- German
4) POTO -- Dutch
5) POTO -- Korean
6) POTO -- Spanish
7) POTO (2004 Soundtrack) -- Italian
AND a whole bunch of them in "British English" instead of "American English."
I do not advise seeing a live show in another language unless you already know the book and score -- I'm sure it's much more frustrating than seeing a foreign language opera, because the story itself is not as important in opera.
One thing I found interesting about listening to POTO in Spanish (a language with which I am somewhat familiar): I was able to tell in a few instances where the translation was not literal, in order to fit the rhyme or meter. "Music of the Night" becomes "Music of the Darkness" (Oscuridad), which slightly changes the meaning.
Audrey, the Phantom Phanatic, who nonetheless would rather be Jean Valjean, who knew how to make lemonade out of lemons.