Change iPhone/Mac OS X locale except for websites?

Hi all, has been a long time. Since I went to the 4th grade of middle school here, I often don’t have much time.

Anyhoo, I’d like to ask something about the locale of the iPhone. I am know studying French at school, and I thought I’d be interesting to see if setting my computers and my iPhone to French could help. Problem is that when you change the system locale, all web pages load in French. This isn’t very much a problem, except with for example news sites, Google/Wikipedia searches and just general surfing. Is there any way to trick sites into thinking my system locale is still Dutch? I’m using Google Chrome on my Mac with Snow Leopard, but I tend to change browsers a lot, so something that works in all browsers would be beneficial. And how could I get something like this to work on the iPhone? (it is jailbroken of course)

Merci beaucoup!

Davey.