switch language

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http://forums.opensuse.org – I have a primary language, Italian, and I want also use a secondary language, English. I want to switch language in order to have all the writings and messages in English not to write special characters by keyboard. I switched language in both kde system settings>Regional & language and in yast system>language leaving the keyboard layout Italian, but in the kde menu (the lizard on the left of panel) the groups of applications (multimedia, giochi, sistema) are in Italian and yast too (impostazioni amministratore), instead others are in English. few questions: 1)is this a bug or I forgot something? 2)which is the differences switching languages by yast and by kde system settings? 3)Is it possible to switch language and don't restart or logout the system? (Distributions)