feat: enable editing of media slug, show categories on manage media

templates/cms/manage_media.html

@@ -11,7 +11,12 @@
 
 {% endblock headermeta %}
 
-{% block content %}<div id="page-manage-media"></div>{% endblock %}
+{% block content %}
+<script>
+window.CATEGORIES = {{ categories|safe }};
+</script>
+<div id="page-manage-media"></div>
+{% endblock %}
 
 {% block bottomimports %}
 <script src="{% static "js/manage-media.js" %}"></script>