The cache-buster querystring seems to be breaking the l10n helper. With that `?2013-09-13' in there, I always get the `en-US` version. If I remove it, I get the proper localized image. Seeing this in Fx & Chrome.

Wondering if the param is necessary - existing images didn't change, we just added new ones, so which shouldn't need cache busting...right?

Might be a good bug to add for that `img_l10n` helper - drop the querystring before checking , then add back in at the end.