New German translations added
Renamed 'Google Map' to 'Google Maps'
Consistant naming of 'MAVLink'. Removed unused string ('MAVLinkError')
'Google Maps' for our Italian friends, too
Merge pull request #1343 from zumbrunnen/i18n_de_updates

I18n: German updates
Merge branch 'master' of github.com:DroidPlanner/droidplanner into version_3_0_13