Proper display of save errors.

templates/save_error.html

@@ -0,0 +1,18 @@
+{% extends "base.html" %}
+
+{% block content %}
+<div class="p-2">
+  <h1>Error saving depicts statements to Wikidata</h1>
+
+  <p>It was not possible to save your edit to Wikidata. The details of the error returned by the Wikidata API are below.</p>
+
+{% for message in error.messages %}
+  <h4>{{ message.name }}</h4>
+  <div class="mb-3">
+    {{ message.html | safe }}
+  </div>
+{% endfor %}
+
+</div>
+
+{% endblock %}