Updated documentation, added German translation

docs-de/seminar-blx.bib

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+@Comment{$ biblatex control file $}
+@Comment{$ biblatex version 1.7 $}
+Do not modify this file!
+
+This is an auxiliary file used by the 'biblatex' package.
+This file may safely be deleted. It will be recreated as
+required.
+
+@Control{biblatex-control,
+  options = {1.7:0:0:1:0:0:1:1:0:0:0:0:1:1:3:1:79:+},
+}