Index registrations by first name, last name and email

templates/search/search.html

@@ -21,7 +21,7 @@
                 <a href="{{ result.object.get_absolute_url }}">{{ result.object }}</a>
             </p>
         {% empty %}
-            <p>No results found.</p>
+            <p>{% trans "No results found." %}</p>
         {% endfor %}
 
         {% if page.has_previous or page.has_next %}