Update CoreSchema class to be consistent with CoreSchemaImpl class

Nicolas Capponi

17.44.2014 d90fd794d2d6263fa98c4e7a7f87c8792070e25c

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