i18n: Taking numberformatsymbolsext into account

There are some errors in certain locale files, I noticed most latin american currencies were wrong. The problem is that closure library keeps a separate file numberformatsymbolsext.js for some languages.

This change uses this file too to generate the correct currency chars.

The locale generation process now downloads number format symbols from
this url too

http://closure-library.googlecode.com/svn/trunk/closure/goog/i18n/numberformatsymbolsext.js

Most locales should now be correct