I now like this idea and would support it in a vote. :)
Cannot Internet Explorer be told to request other languages than the Windows default one?
I think it can, but there are browsers (for example, Konqueror) which can't.
I already explained how, although in my opinion it's pretty well hidden.
Are you sure about Konquerer? I would swear the option is available towards the end of the KDE Control Center. That's a massive control panel, so I guess that's well hidden too... ;)