NetHack in Other Languages

NetHack's verbal output is in English. Although the program's structure does not easily lend itself to localization (since morphological features of English are hard-wired into the source code on all levels), several translation projects currently exist.

Japanese
The Japanese version JNetHack by Issei Numata has been in existence for several years. For those who don't read Japanese, there's some outdated information in English at jnethack.org.

Sourceforge.jp also carries a JSlash'em as well as a Japanese NetHack Resources Project.

Spanish
Ray Chason has published Spanish NetHack as a work in progress.

German
Tony Crawford [news:rec.games.roguelike.nethack/314528 claims] that he and Karl Breuer are working on a German localized version called NetzHack (note the 'z') to be published soon.