sentry: integration with error 500 page

core/templates/core/500.jinja

@@ -0,0 +1,15 @@
+{% extends "core/base.jinja" %}
+{% block head %}
+{{ super() }}
+	<script src="https://browser.sentry-cdn.com/4.0.6/bundle.min.js" crossorigin="anonymous"></script>
+{% endblock head %}
+
+{% block content %}
+	<h3>{% trans %}500, Server Error{% endtrans %}</h3>
+	{% if request.sentry_dsn %}
+	<script>
+		Sentry.init({ dsn: '{{ request.sentry_dsn }}' });
+		Sentry.showReportDialog({ eventId: '{{ request.sentry_last_event_id() }}' })
+	</script>
+{% endif %}
+{% endblock content %}