German football has said this weekend goodbye to one of its most recognizable referees. Deniz Aytekin directed this Sunday the last match of his professional career before his final retirement at the end of the season. He was the Schalke 04 - Preußen Münster of Germany's second division, the 2. Bundesliga, at Veltins Arena in Gelsenkirchen, Schalke Stadium.At age 47, Aytekin ended an extensive race with more than 250 matches in the Bundesliga an…