Fonts: Renamed FontHeight variable to font_height
Fonts: Don't draw map labels in italic

Italic is hard to read and the font size is indicator enough that these
labels are not waypoints, but topography.
Manual XCSoar-Handbuch: Move the current de wrap of the manual into a subdirectory, keep it as "Blitzeinstieg" and free the de directory for a 1:1 translation.