Fix issue triggered by verify-index with --clean option.

ludovicp

28.55.2010 f9c1758fcc5ca282cbb06c2d4364b2aafda01e09

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