Fix#1352 - Preserve querystring when switching language

This is a fix for: http://eden.sahanafoundation.org/ticket/1352
It will also fix language switching problems for all pages where there querytrings  (i.e. ?viewing=) are used. Note that to test this fix you should set "settings.base.debug = True" in 00_config.py until minify is done by flavour. You also need to do browser refresh/reload so the S3.js will be refresh.

This is for GCI task: http://www.google-melange.com/gci/task/view/google/gci2012/8180205
When yu get a chance please close this task as well.

Thanks.