I want to edit quickly lots of pictures in Shotwell. It already has some shortcuts, like `]` for Rotate. However, I work on a Qwertz keyboard, where `]` is typed as `AltGr` + `9`, which means I have to hit two non-home-row buttons with the same hand. It is slow, awkward, and bad for the tendons. 

I would like to map it to some easy key like `R`. Is there a config file somewhere which I can edit?