[maven-release-plugin] rollback changes from release preparation of b2.8

Matthew Swift

28.30.2015 e4105ef195743fa799bbc4e94cd817b5fbbd5b6e

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