Adicionado templates para erros 404 e 500.

sigi/templates/404.html

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+{% extends "admin/base_site.html" %}
+{% load i18n %}
+
+{% block title %}{% trans 'Page not found' %}{% endblock %}
+
+{% block content %}
+
+<h2>{% trans 'Page not found' %}</h2>
+
+<p>{% trans "We're sorry, but the requested page could not be found." %}</p>
+
+{% endblock %}

sigi/templates/500.html

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+{% extends "admin/base_site.html" %}
+{% load i18n %}
+
+{% block breadcrumbs %}<div class="breadcrumbs"><a href="/">{% trans "Home" %}</a> &rsaquo; {% trans "Server error" %}</div>{% endblock %}
+
+{% block title %}{% trans 'Server error (500)' %}{% endblock %}
+
+{% block content %}
+<h1>{% trans 'Server Error <em>(500)</em>' %}</h1>
+<p>{% trans "There's been an error. It's been reported to the site administrators via e-mail and should be fixed shortly. Thanks for your patience." %}</p>
+
+{% endblock %}