Links to Wikipedia were added to the descriptions of cobblestone and sett in the OSM wiki on 5 November 2013 by a German user and on 27 February 2016 by a Portuguese user, but removed by Tordanik on 18 August 2014 and on 28 May 2017.
Here are some important edits in the Wikipedia articles:
Sett:
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4 March 2009, British user: “distinct from a Cobblestone by being quarried or shaped to a regular form”
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8 January 2010, Mexican user: “often incorrectly called ‘cobblestone’, is a broadly rectangular quarried stone”
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4 April 2012, British user: “often idiomatically called ‘cobblestone’, is a broadly rectangular quarried stone”
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3 December 2012, British user: “often idiomatically referred to as “cobbles””
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10 March 2008, British user: “Cobblestones were largely replaced by quarried granite setts in the nineteenth century. Cobblestone is often wrongly used to describe such treatment.”
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1 May 2008, British user Harry Wood on image label: “A cobblestone-covered street” > “A stone-covered street”
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11 August 2012, American user removed sett images
It is also interesting to point out that Harry Wood (user page suggests it’s the same person as in Wikipedia) wrote on the OSM wiki on 1 May 2008 that mappers were already using both cobblestone and sett.