This error was discovered on "Planio":https://plan.io. The attached patch fixes the problem and adds a test to make sure it stays that way.

Maybe @set_localization@ should even be called at the end of @logged_user=@ to make sure a user change also changes the locale? (I haven't tested that though).
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Patch committed in r13670, thanks.

Felix Schäfer wrote:

> Maybe @set_localization@ should even be called at the end of @logged_user=@ to make sure a user change also changes the locale? (I haven't tested that though).

Not sure it would improve things, most @#logged_user=@ are followed by a redirect. And @#set_localization@ would still have to be called in a few places.
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Thanks for the quick merge!
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Pity, it doesn't help in 2.6.0develop
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