Resolve "Show what was changed in crud_events.html"

Closes #274 (closed)

aleksis/core/templates/core/crud_events.html

-{% load i18n %}
+{% load i18n data_helpers %}
 
 <ul class="collection">
   {% for event in obj.crud_events %}
     {% if no_m2m and event.event_type == event.M2M_CHANGE or event.event_type == event.M2M_CHANGE_REV %}
     {% else %}
       <li class="collection-item">
-        {% if event.event_type == event.CREATE %}
-          {% blocktrans with person=event.user.person %}
-            Created by {{ person }}
-          {% endblocktrans %}
-        {% elif event.event_type == event.UPDATE %}
-          {% blocktrans with person=event.user.person %}
-            Updated by {{ person }}
-          {% endblocktrans %}
-        {% elif event.event_type == event.DELETE %}
-          {% blocktrans with person=event.user.person %}
-            Deleted by {{ person }}
-          {% endblocktrans %}
-        {% elif event.event_type == event.M2M_CHANGE %}
-          {% blocktrans with person=event.user.person %}
-            Updated by {{ person }}
-          {% endblocktrans %}
-        {% elif event.event_type == event.M2M_CHANGE_REV %}
-          {% blocktrans with person=event.user.person %}
-            Updated by {{ person }}
-          {% endblocktrans %}
-        {% endif %}
+        <strong>
+          {% if event.event_type == event.CREATE %}
+            {% blocktrans with person=event.user.person %}
+              Created by {{ person }}
+            {% endblocktrans %}
+          {% elif event.event_type == event.UPDATE %}
+            {% blocktrans with person=event.user.person %}
+              Updated by {{ person }}
+            {% endblocktrans %}
+          {% elif event.event_type == event.DELETE %}
+            {% blocktrans with person=event.user.person %}
+              Deleted by {{ person }}
+            {% endblocktrans %}
+          {% elif event.event_type == event.M2M_CHANGE %}
+            {% blocktrans with person=event.user.person %}
+              Updated by {{ person }}
+            {% endblocktrans %}
+          {% elif event.event_type == event.M2M_CHANGE_REV %}
+            {% blocktrans with person=event.user.person %}
+              Updated by {{ person }}
+            {% endblocktrans %}
+          {% endif %}
+        </strong>
 
         <div class="left" style="margin-right: 10px;">
           {% if event.event_type == event.CREATE %}
@@ -43,6 +45,17 @@
         <div class="right">
           {{ event.datetime }}
         </div>
+        {% parse_json event.changed_fields as changed_fields %}
+        {% if changed_fields %}
+          <ul>
+            {% for field, change in changed_fields.items %}
+              {% verbose_name "homework" "assignment" field as verbose_name %}
+              <li>
+                {{ verbose_name }}: <s>{{ change.0 }}</s> → {{ change.1 }}
+              </li>
+            {% endfor %}
+          </ul>
+        {% endif %}
       </li>
     {% endif %}
   {% endfor %}