eliminate extra :

Author: bnmnetp

runestone/parsons/parsons.py

@@ -35,7 +35,7 @@ def setup(app):
 TEMPLATE = """
         <div class="%(divclass)s" style="max-width: none;">
         <pre data-component="parsons" data-question_label="%(question_label)s" id="%(divid)s" %(adaptive)s %(maxdist)s %(order)s %(noindent)s %(language)s %(numbered)s %(optional)s style="visibility: hidden;">
-        <span data-question>%(qnumber)s: %(instructions)s</span>%(code)s
+        <span data-question>%(qnumber)s %(instructions)s</span>%(code)s
         </pre>
         </div>
     """