Add storage strings to other locales

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@2710 eee81c28-f429-11dd-99c0-75d572ba1ddd
Simplify storage checking/access

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@2711 eee81c28-f429-11dd-99c0-75d572ba1ddd
Require extensions to begin with "ext-" and end with ".js" to prevent URL-prompted loading of other files within the extPath.

git-svn-id: http://svg-edit.googlecode.com/svn/trunk@2712 eee81c28-f429-11dd-99c0-75d572ba1ddd