Add stopwatch icon ('jwinf')

templates/jwinf/contest.hbs

@@ -83,7 +83,7 @@
 <p>
   <form action="" method="post">
     <input type="hidden" name="csrftoken" value="{{csrftoken}}">
-    <input class="button is-warning" type="submit" value="⏲ &nbsp; Jetzt starten!">
+    <input class="button is-warning" type="submit" value="⏱ &nbsp; Jetzt starten!">
   </form>
                   </p>