I uploaded a small update version 0.1.1.
Changelog:
* Changed default background to /etc/hildon/theme/backgrounds/lockslider.png
* Changed font settings, format = "fontName;fontSize;fontWeight;italic"

I also added some comments to the default configuration file, refer to the first post.

If you changed some FontSize settings please read the comments in the configuration file and rechange your font settings string (I removed the settings named *FontSize)