Hello Dag Wixforth, this one could be Lamium maculatum (gefleckte Taubnessel), have a look:
http://de.wikipedia.org/wiki/Gefleckte_Taubnessel
However, please check the date you spotted this plant. Here it says March 16, 2012 but it looks more like it was spotted sometime in autumn.
Cheers, Meik
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