Fix minor error on Java version required.

Ludovic Poitou

06.05.2015 a3c5e0daf7af82b2f748c4fe5dcd577c4fa20d0d

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