Updated OS icons

LICENSE.txt

@@ -49,3 +49,5 @@ See https://creativecommons.org/licenses/by-sa/4.0/
      - Guernsey and Isle of Man flags from the Open Clip Art Library, released into the public domain
      - Curaçao, courtesy of David Benbennick, released into the public domain
      - All other flag icons: public domain, courtesy mjames@gmail.com http://www.famfamfam.com/
+   OS icons (i2p2www/static/images/download/):
+     - Courtesy dakirby309 http://dakirby309.deviantart.com/art/Metro-UI-Icon-Set-725-Icons-280724102