Changes following translatewiki update, including:
- Adding Czech (cs) to Puzzle.
- Adding German (de) to Index.
- Back-propagating changes to qqq.json.
- Updating instructions for regenerating apps language files.
This CL currently only contains additions and manual modifications.
Generated files will be added after review.

R=neil.fraser@gmail.com

Review URL: https://codereview.appspot.com/25560043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1488 c400ca83-b69d-9dd7-9705-49c6b8615e23