Code cleanup in the virtual attributes.

Jean-Noel Rouvignac

12.27.2013 138a3114de9e1b69a16c67f052d01270c05064d6

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