From the Apple Menu, select System Preferences.
After you purchase and install Photoshop Elements from the Mac App Store, the product is in German instead of English
Change the language priority of your OS.
Remove German language support from your OS.
When you install Photoshop Elements from the Mac App Store, it can be in English, French, German, or Japanese. A setting in the OS System Preferences is passed to Photoshop Elements to determine the language used. For more information about your OS language settings, check here: Mac OS X: Changing the language used to display menus and dialogs.