While there is the rare occasion of a Swede not talking English, at best you'll find it being broken language.
Swedish and English are incredibly similar languages, thus personally unless I'd be visiting a country where English isn't spoken at all - I wouldn't even bother learning any other words than "hello" "thank you" and "good bye".
But this is ultimately just my own opinion, whatever you decide is entirely up to you.
I hope you'll enjoy your trip mate!.