appearance tweaks

backend/app/templates/500.html

@@ -2,7 +2,7 @@
 
 {% block content %}
 
-	<h1>An unexpected error has occurred.</h1>
+	<h2>An unexpected error has occurred.</h1>
 	<p>Administrator has been notified.</p>
 	<p><a href="{{ url_for('index') }}">Back</a></p>