Changes to .js file generation for all apps.
Moved .js files into subdirectory named 'generated'.
Renamed i18n/json-to-xlf.py to i18n/json-to-js.py, reducing number of
steps to produce .js files.
Also removed extraneous quotation mark.
TODO: Change MOOC branch.

Review URL: https://codereview.appspot.com/11938043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1155 c400ca83-b69d-9dd7-9705-49c6b8615e23