Unfortunately Blattodea is really a large group of cockroaches. Checking some I only know which candidates are ruled out. My closest guess would be Oxyhaloa deusta, Red-headed Cockroach. Do you remember a reddish head?? I cannot see it with this perspective from your slightly blurred picture. But I see some similar markings at the margins.
http://www.schaben-spinnen.de/Data/Articles/00000%20oxy.jpg
http://www.schaben-spinnen.de/Data/Articles/00000%20oxy%201.jpg
http://www.ispot.org.za/species_dictionary/Oxyhaloa%20deusta
What do you think?
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