iOS App Store - how does localized language settings work?

I recently released an app on Apples App Store and currently have it available in 2 languages, Swedish & English(U.S.). So my question is, what language will be presented to other English speaking countries since I picked English(U.S.)?. Do I have to add a description for all of them, for example, Australia & the U.K to avoid displaying the Swedish version of the app in the app store?