djangocms_pagebanner: Provide a more useful __unicode__
djangocms_pagebanner: Provide a more useful __unicode__

okfn/website,okfn/foundation,okfn/website,MjAbuz/foundation,MjAbuz/foundation,MjAbuz/foundation,okfn/website,okfn/website,okfn/foundation,okfn/foundation,MjAbuz/foundation,okfn/foundation