show bootstrap_messages in level detail and space detail editor view

src/c3nav/editor/templates/editor/level.html

@@ -10,6 +10,7 @@
         {% endwith %}
     {% endif %}
 </h3>
+{% bootstrap_messages %}
 <p>
     <a class="btn btn-default btn-xs" accesskey="e" href="{% url 'editor.levels.edit' pk=level.pk %}">
         {% trans 'Level' as model_title %}

src/c3nav/editor/templates/editor/space.html

@@ -3,6 +3,7 @@
 {% include 'editor/fragment_levels.html' %}
 
 <h3>{{ space.title }}</h3>
+{% bootstrap_messages %}
 <p>
     <a class="btn btn-default btn-xs" accesskey="e" href="{% url 'editor.spaces.edit' level=space.level.pk pk=space.pk %}">
         {% trans 'Space' as model_title %}