iWork/Pages language/dictionary help required

I am not sure if iWork and or Pages support various languages by default or not. When I write a document in Pages I set it to auto check my spelling, which it does. The problem is I normally write in German and a german dictionary and spelling checker seems to be in place, but when I then write in english it still tries to check the spelling with the german dictionary. I do not know where to change the language for the spell checker or if needed how to install a english dictionary and spell checker. I only got my first iMac a couple of days ago and this is my first try with Pages. Any and all help will be greatly appreciated.