Convert Code to be language-free.  Rename zh_tw to zh-tw (the latter being correct with ISO).

R=spertus@google.com

Review URL: https://codereview.appspot.com/11609043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1116 c400ca83-b69d-9dd7-9705-49c6b8615e23
Convert Graph to be language-free.

R=spertus@google.com

Review URL: https://codereview.appspot.com/11564043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1117 c400ca83-b69d-9dd7-9705-49c6b8615e23
Convert Turtle to be language-free.  Change Puzzle to use getMsg.  Factor out some common functions in apps.

R=spertus@google.com

Review URL: https://codereview.appspot.com/11511045

git-svn-id: http://blockly.googlecode.com/svn/trunk@1118 c400ca83-b69d-9dd7-9705-49c6b8615e23