Generalize toast view template

// FREEBIE

background.html

@@ -48,8 +48,8 @@
     </a>
     {{ expiredWarning }}
   </script>
-  <script type='text/x-tmpl-mustache' id='expired_toast'>
-    {{ expiredWarning }}
+  <script type='text/x-tmpl-mustache' id='toast'>
+    {{ toastMessage }}
   </script>
   <script type='text/x-tmpl-mustache' id='hint'>
     <p> {{ content }}</p>

js/views/conversation_view.js

@@ -6,11 +6,8 @@
     window.Whisper = window.Whisper || {};
 
     Whisper.ExpiredToast = Whisper.ToastView.extend({
-        templateName: 'expired_toast',
         render_attributes: function() {
-            return {
-                expiredWarning: i18n('expiredWarning')
-            };
+            return { toastMessage: i18n('expiredWarning') };
         }
     });
 

js/views/toast_view.js

@@ -7,6 +7,7 @@
 
     Whisper.ToastView = Whisper.View.extend({
         className: 'toast',
+        templateName: 'toast',
         initialize: function() {
             this.$el.hide();
         },