upd

custom_theme/404.html

@@ -0,0 +1,11 @@
+{% extends "base.html" %}
+
+{% block content %}
+
+    <div class="row-fluid">
+      <div id="main-content" class="span12">
+        <h1 id="404-page-not-found" style="text-align: center">404 - Страница не найдена</h1>
+      </div>
+    </div>
+
+{% endblock %}