fix editor bug for announcement title

app/assets/javascripts/form.js

@@ -1,6 +1,8 @@
 $(document).ready(function() {
   var config = {}
   config.autoGrow_minHeight = 50;
+  config.allowedContent = false;
+  config.disallowedContent = 'img';
   config.toolbar = [
     { name: 'clipboard', items: [ 'Cut', 'Copy', 'Paste', 'PasteText', 'PasteFromWord', '-', 'Undo', 'Redo' ] },
     { name: 'editing', items: [ 'Find', 'Replace', '-', 'SelectAll', '-', 'Scayt' ] },