[views] don't use <b>, use a diff

views.py

@@ -293,7 +293,7 @@
                 else:
                     del url_params['es_{}'.format(attribute)]
                 url = self._cw.build_url(**url_params)
-                content = selected and '<b>{}</b>'.format(tag) or tag
+                content = selected and '<div class="facet-active">{}</div>'.format(tag) or tag
                 self.w(facet_item.format(url,
                                          content,
                                          count))