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This is not entirely so. When I visited Japan, my browser prompted "We've detected you've moved to Japan, would you like to change..."

That to me seems wrong. No one learns a language in 7 hours.

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But many people learn a language before going to a country, and some portion of those will want to use it because switching back and forth between languages can be hard. I don't think it's a bad question to ask, at all.

You could speak both and prefer to use the Japanese version when in Japan (to get better local results, for instance). The site has no way of knowing your particular situation, so they ask rather than defaulting to one or the other.

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