show time range support in preferences

searx/templates/oscar/preferences.html

@@ -158,6 +158,7 @@
 				    <th>{{ _("Engine name") }}</th>
 				    <th>{{ _("Shortcut") }}</th>
 				    <th>{{ _("SafeSearch") }}</th>
+				    <th>{{ _("Time range") }}</th>
 				    <th>{{ _("Avg. time") }}</th>
 				    <th>{{ _("Max time") }}</th>
                                     {% else %}
@@ -179,6 +180,7 @@
                                     <th>{{ search_engine.name }}</th>
 				    <td>{{ shortcuts[search_engine.name] }}</td>
 				    <td><input type="checkbox" {{ "checked" if search_engine.safesearch==True else ""}} readonly="readonly" disabled="disabled"></td>
+				    <td><input type="checkbox" {{ "checked" if search_engine.time_range_support==True else ""}} readonly="readonly" disabled="disabled"></td>
 				    <td class="{{ 'danger' if stats[search_engine.name]['warn_time'] else '' }}">{{ 'N/A' if stats[search_engine.name].time==None else stats[search_engine.name].time }}</td>
 				    <td class="{{ 'danger' if stats[search_engine.name]['warn_timeout'] else '' }}">{{ search_engine.timeout }}</td>
                                     {% else %}