Localisation updates from http://translatewiki.net.

git-svn-id: http://blockly.googlecode.com/svn/trunk@1503 c400ca83-b69d-9dd7-9705-49c6b8615e23
Incorporated latest translatewiki pages.
Added to index page: Danish, Spanish, Hungarian, Vietnamese, and Piedmontese.
Added Italian as the secondary language for Piedmontese.

R=neil.fraser@gmail.com

Review URL: https://codereview.appspot.com/29240043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1505 c400ca83-b69d-9dd7-9705-49c6b8615e23