If you install Juicy's new ROM:
http://forum.ppcgeeks.com/showthread.php?t=60601
Then you can translate the TF3D in spanish using tf3d config:
http://forum.xda-developers.com/showthread.php?t=405749
Install the cab file, then make sure you delete the xml file in the program folder. Otherwise you will get an error message when starting it.
Then you go into apperance, Language, and swich it to Spanish.
The windos mobile will remain in english but your Touch Flow interface will be in spanish!
Enjoy!