Are you sure you have the keyboard layout set to Swedish? I have a Swedish keyboard, and the key to the right of Ä gives me an apostrophe without any modifiers, as stated on the key. If I change to the US layout however, I get the same result as you do.What you have to do is change the layout to Swedish in System preferences -> Keyboard -> "Textinmatnig" in Swedish, I don't know what the setting is called in English, and add the "Svensk" layout.