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Yeah, that's been bothering me a lot lately. I live in the French part of Switzerland and I speak French, but 99% of my web search are English queries related to technical stuff. I have my browser with English set as the primary language, an English OS. Jesus, I even have English set as my first language in my damn user account.
Yet, I get the fucking search results in French (they aren't really good when doing an English query).
But it's even worst than that. They have no coherence across their properties. The other day, I got the account settings page in German (I don't speak German, but some parts of Switzerland do). And when I go on G+, it's always in English. Seriously, how hard is it to just pick the language the user selects. I know better than some half-assed geographical based algorithm.