UX and HTML corrections

Put the infobox first. Result first is more useful for the user.
Add id in form for "for".
htmlentities in the URL.
Take care of spaces in categories.

searx/templates/oscar/results.html

         </div><!-- /#main_results -->
 
         <div class="col-sm-4" id="sidebar_results">
+            {% if infoboxes %}
+                {% for infobox in infoboxes %}
+                    {% include 'oscar/infobox.html' %}
+                {% endfor %}
+            {% endif %} 
 
             {% if suggestions %}
             <div class="panel panel-default">
                     <form role="form">
                         <div class="form-group">
                             <label for="search_url">{{ _('Search URL') }}</label>
-                            <input type="url" class="form-control select-all-on-click cursor-text" name="search_url" value="{{ base_url }}?q={{ q|urlencode }}&pageno={{ pageno }}{% if selected_categories %}&category_{{ selected_categories|join("&category_") }}{% endif %}" readonly>
+                            <input id="search_url" type="url" class="form-control select-all-on-click cursor-text" name="search_url" value="{{ base_url }}?q={{ q|urlencode }}&amp;pageno={{ pageno }}{% if selected_categories %}&amp;category_{{ selected_categories|join("&category_")|replace(' ','+') }}{% endif %}" readonly>
                         </div>
                     </form>
                     
                     <div class="clearfix"></div>
                 </div>
             </div>
-        
-        {% if infoboxes %}
-            {% for infobox in infoboxes %}
-                {% include 'oscar/infobox.html' %}
-            {% endfor %}
-        {% endif %}    
-        
         </div><!-- /#sidebar_results -->
     </div>
 {% endblock %}