In real live my name is Matthias Freund and i'm a native speaking german living in berlin.
I helped to translate the old german comments inside the ancient source code into english in the first jear or so. (If you find a german text inside the sources, please feel free to contact me if you need a translation or give me simply a hint what should I translate next.)
At the moment I'm active in the design team and I draw these monochome "SIFR" icons to complete this fantastic simple and non disturbing icon set. The goal ist to cover the amount of icons of the tango icon set. Not an easy task with lack of free time to do this.
It would be great if someone could help. It is lot to do, all icons (more than 700!) has to be redrawn for 32px/scalable size for UHD displays. You can contact me simply via irc or jabber