Update Localizable.strings

Changed the German translation for the screen layouts to „Horizontal“ (Report), „Vertikal“ (Condensed) and „Widescreen“ (Unified) because I think the current names can be misleading. Not 100% sure about Widescreen. Fullscreen could be misleading too but it's closer to what I think would fit. Maybe something like „No Headline“/„No Headline Column“?

Maybe it would make sense to change the names in the English version as well? I don't really understand what they're supposed to mean either but then again I'm not a native speaker.

And I have no idea where to do that.