Here are Links for a german textversion
http://www.rpguides.de/pst/artikel.php?aid=117

Nice, I'll be adding it to my list of Multilingual GOGs, if you don't mind.

to me that looks like there is only a patch to make the german version english and to fix some typing errors in the german version. I don't see a english -> german patch there

i think thats actually to make the english version german, the description says something like

"this patch is only for the german version, and it translates the english texts into german. so if you have problems understand the english version you now can enjoy the game"

i think the first "german" is wrong, the rest of the description doesnt make sense for a german version

As the Website from the Startingpost is discontinued and as far as i can see the Patch from there isn't available anymore, I recommend the Beta-Translation from here
http://www.planescape-torment.de/Dialog.zip