fix: Incorrect symbols on wiki create article page (#32628)

The message was being double-escaped by React with the
StatusAlertRenderer. This fixes the problem by removing the
first layer of HTML-escaping so it is only escaped once.

lms/templates/wiki/base.html

@@ -76,11 +76,15 @@
           {% block wiki_breadcrumbs %}{% endblock %}
 
           {% if messages %}
+            {% comment %}
+              The message is not actually safe, but StatusAlertRenderer uses react which adds escaping,
+              so marking as safe keeps the message from being double-escaped.
+            {% endcomment %}
             {% for message in messages %}
               <div id="alert_stat_bar"></div>
               <script type="text/javascript">
                 new StatusAlertRenderer(
-                  "{{ message }}",
+                  "{{ message|safe }}",
                   "#alert_stat_bar",
                   ".nav nav-tabs"
                 );