Moved common messages from apps/template.soy to {maze,turtle}/template.soy.
This includes moving translations from apps/*.json to apps/maze/*.json.
This will reduce the number of network fetches, at the expense of abstraction.
NOTE: "\n" is displayed in the link alert message for turtle but not for maze.
I assume this will go away when turtle is converted to language-free format.
TODO: Do same change for graph and code.
TODO: Find somewhere else for translation of "a visual programming environment".

R=neil.fraser@gmail.com

Review URL: https://codereview.appspot.com/11379043

git-svn-id: http://blockly.googlecode.com/svn/trunk@1103 c400ca83-b69d-9dd7-9705-49c6b8615e23