Add support for audio notes playback ...

... by using an external application like 'aplay'.
This commit also stores the presence of .txt and .wav files in image
flags and updates these in the startup crawler. So if you no longer see
your text overlay: run the crawler (at least) once.
Fix the use of jobcode that got removed by mistake.
This fixes bug #9789
lowpass: unbound processing
Italian translation updated
Updated Danish translation
Merge pull request #445 from bartokk/master

Italian translation updated
Merge pull request #446 from pryds/master

Updated Danish translation