[jnsaff2]

Mine is Firefox default "Accept-Language: en-US,en;q=0.5" yet google maps and search turned into French when I was in Luxembourg just for couple of days. Luckily they don't turn to ruscish any more when I'm in baltics.

My youtube ads are the same 2-3 casino/sports betting things over and over again. Tho I never have nor never will partake in any of those nor have I ever clicked on one, so it is just unbelievably stupid.

[kgfufogudig]

I’ve heard en-US is often considered as a default value and thus to be ignored when deciding user language. Set it to any other en-* value and chances are that it will override local indicators such as country IP.

[benplumley]

That's really weird then. I'm often in Thailand and Google's never tried to change my interface language, though it does keep suggesting videos in Thai.