Revert "Modify a few tutorial messages according to the z/Z changes" from master too.

This reverts commit eb076f4e8e72b8c9f839892bf8d1aba4838bf06a.

Created by  evktalo  on October 6, 2009
WM5WABTHTKKYI36MN4SYHCGRNJGMFRY2K7PJGCWPIMDCOVPCRGGAC
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