I use the same version, also in German, and it works fine for me. What
does
dpkg -L network-manager-gnome|grep glade
print for you?
** Changed in: network-manager (Ubuntu)
Status: Unconfirmed => Needs Info
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[feisty] network-manager connection infos broken (missing glade file)
https://bugs.launchpad.net/bugs/106839
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