It was not easily possible to load plans from plan folder before 0.18.2. Watch API Docs and changelog for Avorion 0.18.2 and install beta branch. Did not try this by myself yet and gotta go to work soon. May try it later.
Okay i in the beta already, the same as before it still does nothing, if you can please try it im going to take my time reading the API Docs, thanks for your help! and you too Laserzwei :P