Add urbandictionary query

dotfiles/saturnin/www.ini

     se      = http://slovnik.cz/bin/mld.fpl?dictdir=encz.en&lines=90&vcb=%s
     sd      = http://slovnik.cz/bin/mld.fpl?dictdir=gecz.ge&lines=90&vcb=%s
     sf      = http://slovnik.cz/bin/mld.fpl?dictdir=frcz.fr&lines=90&vcb=%s
+    ud      = http://www.urbandictionary.com/define.php?term=%s
     tfd     = http://www.thefreedictionary.com/%s
     w       = http://en.wikipedia.org/wiki/%s
     wa      = https://www.wolframalpha.com/input/?i=%s