Change icon set of announcements

aleksis/core/templates/core/announcement/form.html

@@ -30,7 +30,7 @@
     {% form form=form %}{% endform %}
 
     <button type="submit" class="btn green waves-effect waves-light">
-      <i class="material-icons left">save</i>
+      <i class="material-icons left iconify" data-icon="mdi:content-save-outline"></i>
       {% trans "Save und publish announcement" %}
     </button>
   </form>

aleksis/core/templates/core/announcement/list.html

@@ -9,7 +9,7 @@
 
 {% block content %}
   <a class="btn green waves-effect waves-light" href="{% url "add_announcement" %}">
-    <i class="material-icons left">add</i>
+    <i class="material-icons left iconify" data-icon="mdi:add"></i>
     {% trans "Publish new announcement" %}
   </a>
   <table class="highlight">
@@ -32,13 +32,13 @@
         <td>
           <a class="btn-flat waves-effect waves-orange orange-text"
              href="{% url "edit_announcement" announcement.id %}">
-            <i class="material-icons left">edit</i>
+            <i class="material-icons left iconify" data-icon="mdi:pencil-outline"></i>
             {% trans "Edit" %}
           </a>
           <form action="{% url "delete_announcement" announcement.id %}" method="post">
             {% csrf_token %}
             <button class="btn-flat waves-effect waves-re red-text" type="submit">
-              <i class="material-icons left">delete</i>
+              <i class="material-icons left iconify" data-icon="mdi:delete-outline"></i>
               {% trans "Delete" %}
             </button>
           </form>