Since I made the mod, I will explain. I only tested it with the English version, so I'm not sure if it works correctly with the German one. Apparently, someone has the exact same problem on Holowan Labs: http://www.lucasforums.com/showthread.php?t=154662 .
The order is supposed to be as follows:
1. In the Sith Academy, pick the datapad from the dead Twi'lek (who is actually Lonna Vash's Padawan, Kaah Ohtok).
2. Insert it into the console.
3. Open the Academy door from the console. It isn't necessary to play the holorecord.
4. After leaving the Academy, enter the cave. While you're cros