Problems when using special characters

[DirkFreise]

First of all - thanks for providing this very useful piece of software.

Here is the issue. If I want to remove the green color label (which is "grün" in German) it is not removed. I can add it (tag -a "Grün" filename) which works perfectly, but removing it does not work (tag -r "Grün" filename).

Since the name of the color labels are set by the system it would be really great if you could fix this.

Thanks a lot,

Dirk