Changed posting loader icon.

misago/templates/misago/posting/formset.html

@@ -41,7 +41,7 @@
           <button class="btn btn-default" type="button" name="cancel">{% trans "Cancel" %}</button>
 
           <strong class="ajax-loader text-muted fade">
-            <i class="fa fa-cog fa-fw fa-spin"></i>
+            <i class="fa fa-circle-o-notch fa-fw fa-spin"></i>
             {% trans "Posting..." %}
           </strong>