AddOpdsFavouriteViewControllerIP.strings: Add German translation
AddWebFavouriteViewControllerIP.strings: Add German translation
BookInfoPanelViewControllerIP.strings: Add German translation
BookScrollerItemViewController.strings: Add German translation
ClockMenuViewControllerIP.strings: Add German translation
ColourSubViewControllerIP.strings: Add German translation

Note: If "Alternative" is too long and gets changed, remember to check
the iPad file, too.
EditCustomMenuViewControllerIP.strings: Add German translation