By default, terrains right now run with pacific textures / objects. To use the European textures / objects you need to assign it with a defset.txt file.
To do this:
Create a text file with notepad.
Place a 1 in the file.
Save as defset.txt.
Place text file in root directory of the terrain you're working on.
you should now have European textures/objects when you open your terrain the next time.