Renamed Activity to History in episode details modal

Closes #624

src/UI/Episode/History/EpisodeHistoryActionsCell.js

@@ -0,0 +1,35 @@
+var $ = require('jquery');
+var vent = require('vent');
+var Marionette = require('marionette');
+var NzbDroneCell = require('../../Cells/NzbDroneCell');
+
+module.exports = NzbDroneCell.extend({
+    className : 'episode-actions-cell',
+
+    events : {
+        'click .x-failed' : '_markAsFailed'
+    },
+
+    render : function() {
+        this.$el.empty();
+
+        if (this.model.get('eventType') === 'grabbed') {
+            this.$el.html('<i class="icon-sonarr-delete x-failed" title="Mark download as failed"></i>');
+        }
+
+        return this;
+    },
+
+    _markAsFailed : function() {
+        var url = window.NzbDrone.ApiRoot + '/history/failed';
+        var data = {
+            id : this.model.get('id')
+        };
+
+        $.ajax({
+            url  : url,
+            type : 'POST',
+            data : data
+        });
+    }
+});