Allows external scripts (including the Gadget selection script) to setup
 a locale through a property named __gwt_Locale on window.  This is 
intended to allow the Gadget selection script can populate locale,
but could serve as a general purpose mechanism.

Patch by: bmccann,zundel
Review by: jat


git-svn-id: https://google-web-toolkit.googlecode.com/svn/releases/1.6@4644 8db76d5a-ed1c-0410-87a9-c151d255dfc7