AI 143659: am: CL 143472 Reduce dictionary size.

  Changed the tree structure to have variable length nodes to save an average of 21% on the dictionary size.
  Created a shortened English dictionary for Dream - 50K words.
  Added a shortened Spanish dictionary for Dream - 32K words.
  Original author: yamasani
  Merged from: //branches/cupcake/...

Automated import of CL 143659