Improved error message in case a missing scheme handler was detected.


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@342 024a02f7-42f7-40fc-9f58-65666d1f2450
Updated German translations.


git-svn-id: http://sbuild.tototec.de/svn/sbuild/trunk@343 024a02f7-42f7-40fc-9f58-65666d1f2450