Finally I found it!!! It's from the Catherine Tate Show
THIS link should work better! Italian and the unknown African language are the best. I only wish there was a Slavic language, too. I guess it would be something like ччяяшшшшсс, славввчъъъшшсст
Oh yeah this video is really funny, although it has been posted on Unilang a number of times. My favourites are the French, Italian and Swedish translations.