Please revert the name change of the Contacts app again, i.e. name the Contacts app again "Contacts" (now: "Sample content").

After a discussion with Philipp, we decided that simply renaming the app was not enough: it would have to move groups as well. Plus, the Contacts app is currently referenced from STK. We also believe that the change causes the apps screen to look unfinished, which is very counter-productive.