ubuntu 12.04 switch window does not change language

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http://askubuntu.com – I used to work with ubuntu 10.04, in which every window retained the selected language. So if I where to write in english in one window and in another language in some other window, switching back and forth using alt+tab would keep the windows each in its own language I have now installed 12.04 but I see that the language setting affects all windows. Is there a way to toggle this behavior? Thanks in advance (HowTos)