add engine's name in infobox's header

searx/results.py

@@ -60,6 +60,8 @@ def merge_two_infoboxes(infobox1, infobox2):
     if weight2 > weight1:
         infobox1['engine'] = infobox2['engine']
 
+    infobox1['engines'] |= infobox2['engines']
+
     if 'urls' in infobox2:
         urls1 = infobox1.get('urls', None)
         if urls1 is None:
@@ -189,6 +191,7 @@ class ResultContainer(object):
     def _merge_infobox(self, infobox):
         add_infobox = True
         infobox_id = infobox.get('id', None)
+        infobox['engines'] = set([infobox['engine']])
         if infobox_id is not None:
             parsed_url_infobox_id = urlparse(infobox_id)
             for existingIndex in self.infoboxes:

searx/templates/oscar/infobox.html

@@ -2,6 +2,11 @@
 <div class="panel panel-default infobox">
     <div class="panel-heading">{{- "" -}}
         <div class="infobox_part">
+            <div class="{% if not rtl %}pull-right{% endif %}">
+            {% for engine in infobox.engines %}
+                <span class="label label-default">{{ engine }}</span>
+            {% endfor %}
+            </div>
             <h4 class="panel-title"><bdi>{{ infobox.infobox }}</bdi></h4>{{- "" -}}
             {% for u in infobox.urls %}{% if u.official %} <a href="{{ u.url }}">{{ u.domain }}</a>{% endif %}{% endfor %}
         </div>