issue2551075 Update jinja template to bootstrap 4. Updated to 4.1.3 (current boostrap version 4.4.1). The pull request has been around for a while. (Patch: Paul Spooner; templates merged by Christof Meerwald; other merged by John Rouillard)

try:
    # Python 3+.
    from xmlrpc import client, server
    server.SimpleXMLRPCDispatcher
except (ImportError, AttributeError):
    # Python 2.
    import xmlrpclib as client
    import SimpleXMLRPCServer as server