Removed API level dependent theme definition

Instead: different builds for different API levels
German translation
Manifest: Removed too much. Fixed.
Manifest: Added targetSdkVersion

Target version is API lvl 11, so that on devices running API lvl 11 or
greater don't use compatibility behaviours, but app stays usable on
devices running API lvl 10 (or probably lower, not tested)
i18n: Replaced remaining hard coded strings
Version 1.1.3: Updated manifest and readme