Populate and translate the countries list with product-details.

Had to add product-details to the codebase (didn't want to submodule).
People will have to run `./manage.py update_product_details` to get
it working.

Right now the sort is on the translated country name. I'm not sure if
this is really the appropriate sort in non-ascii character sets, but it
does seem to go in byte order, so if unicode is really in proper order it
should work well.

@jgmize r?