dashboard: show if mass op is denied by permission

circle/dashboard/static/dashboard/dashboard.css

@@ -934,7 +934,7 @@ textarea[name="list-new-namelist"] {
 }
 
 .mass-op-panel .status-icon {
-  font-size: 1.5em;
+  font-size: .8em;
 }
 
 #vm-list-search, #vm-mass-ops {

circle/dashboard/templates/dashboard/mass-operate.html

@@ -17,10 +17,11 @@ Do you want to perform the <strong>{{op}}</strong> operation on the following {{
   <div class="panel panel-default mass-op-panel">
     <i class="fa {{ i.get_status_icon }} fa-fw"></i>
     {{ i.name }} ({{ i.pk }})
-    <div style="float: right;" title="{{ i.disabled }}">
-      <i class="fa status-icon
-        {% if i.disabled %}fa-minus-square minus{% else %}fa-check-square check{% endif %}">
-      </i>
+    <div style="float: right;" title="{{ i.disabled }}" class="status-icon">
+      <span class="fa-stack">
+        <i class="fa fa-stack-2x fa-square {{ i.disabled|yesno:"minus,check" }}"></i>
+        <i class="fa fa-stack-1x fa-inverse fa-{% if i.disabled %}{{i.disabled_icon|default:"minus"}}{% else %}check{% endif %}"></i>
+      </span>
     </div>
   </div>
   <input type="checkbox" name="vm" value="{{ i.pk }}" {% if not i.disabled %}checked{% endif %}

circle/dashboard/views.py

@@ -78,7 +78,8 @@ from .tables import (
     GroupListTable, UserKeyListTable
 )
 from common.models import (
-    HumanReadableObject, HumanReadableException, fetch_human_exception
+    HumanReadableObject, HumanReadableException, fetch_human_exception,
+    create_readable,
 )
 from vm.models import (
     Instance, instance_activity, InstanceActivity, InstanceTemplate, Interface,