Reproduced on OS X 10.7.5 with both mentioned builds (stable branch, pre2 tarball) if launching inkscape with locale de_DE:
$ LANG=de_DE.UTF-8 inkscape Programm_Flyer_Entwurf_2016.svg
Reproduced on OS X 10.7.5 with both mentioned builds (stable branch, pre2 tarball) if launching inkscape with locale de_DE:
$ LANG=de_DE.UTF-8 inkscape Programm_ Flyer_Entwurf_ 2016.svg