Thanks for the nice review. It's nice to see someone else going through the program, so I can fix problems that I did not really see (the "Delete" button is going to be renamed to "Delete memo", and "Clear" (Löschen) is going to be renamed to "Clear contents" (Inhalt leeren)). I also should revisit the German translation, as it's incomplete again due to all the changes since the last translation run.

I already wondered why the arrow key shortcuts weren't working - they should be assigned to the node view, not the overview, and I think it's even better to have them in the AppMenu. Right now, I've simply assigned the shortcuts to the right view, but I should eventually add check buttons to the AppMenu (for better discoverability - I guess you only discovered that by accident or looked into the source ).