Welcome to Android Central! I did a Google translate: "how to make a memory card into the tablet default to all applications were downloaded there"
Apps always have to download and install to internal storage first. Then, if the device allows it, you can move a portion of the app to the SD card. Even if rooted, I don't think you can force apps to download and install directly to SD.
Echoing B. Diddy:
You would have to root the device, but that won't make all of the application data go there. By default, it has to go to the internal storage. Depending on the developer, not much, if any space would be able to be moved.
