Revert "kein HTML-Rumpf im AboutDialog"

This reverts commit e66e90403af7a7d6344b5d805ac796035459ebc1.
Revert "Revert "kein HTML-Rumpf im AboutDialog""

This reverts commit 115022adede21a5328c9ee7515a47df1671ed73e.
erster Serverentwurf