Add support for statistics for WorkFlowElements

ludovicp

31.03.2010 a3397ec4e0e6c70b6caab535173a08bbefb62ef4

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user-friendly-name=Sk\u0142adnia Atrybut\u00f3w
user-friendly-plural-name=Sk\u0142adnie Atrybut\u00f3w