fix checkstyle issues for new maven plugins

Nicolas Capponi

05.03.2015 17c75eab3d7c75afab1476bf8f021e7debe20641

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relation.plugin.user-friendly-name=Wtyczka
user-friendly-name=\u015acie\u017cka Wtyczek
relation.plugin.user-friendly-plural-name=Wtyczki