Hi its settings > General ( if you cant read German its the 7th one down on left hand window) , Once you have highlighted this scroll right down to the bottom to internatioal
(3rd from the bottom) , Then select the 1st one Language > when it opens the small window on my ipad 2 its 1st one i dont no if that because i have it set on english but i googled and english in German is Englisch select that and you should be fine good luck
If you set up your iPad to the German app store, you'll need to change under your Apple ID. Go to app store, scroll to bottom to view your ID. Sign in. Under your address, you can change country or region.
LOL @ ME what a idiot typical of me to dive in without reading it right 1st omg! i even went into full length discription , i even googled what english meant in german LOL!!!
Sorry