Thanks, at least the menu's categories (02-modifications-BionicDog.squashfs, 5MB) and the programs (99-langpack-BionicDog.squashfs, 2MB, DE only)Wow ! you made it all German, nice job !
Re the 'issue':
In reading '/etc/xdg/menus/applications-merged' I had overseen the -merged part, so I missed the main hint...
However, it works by now. Thanks!
Rainer