New: Show age when grabbed on history details

src/UI/History/Details/HistoryDetailsAge.js

@@ -0,0 +1,19 @@
+'use strict';
+define(
+    [
+        'handlebars'
+    ], function (Handlebars) {
+
+        Handlebars.registerHelper('historyAge', function () {
+
+            var unit = 'days';
+            var age = this.age;
+
+            if (age < 2) {
+                unit = 'hours';
+                age = parseFloat(this.ageHours).toFixed(1);
+            }
+
+            return new Handlebars.SafeString('<dt>Age (when grabbed):</dt><dd>{0} {1}</dd>'.format(age, unit));
+        });
+    });

src/UI/History/Details/HistoryDetailsView.js

@@ -1,10 +1,11 @@
 'use strict';
 define(
     [
+        'jquery',
         'vent',
         'marionette',
-        'jquery'
-    ], function (vent, Marionette, $) {
+        'History/Details/HistoryDetailsAge'
+    ], function ($, vent, Marionette) {
 
         return Marionette.ItemView.extend({
             template: 'History/Details/HistoryDetailsViewTemplate',

src/UI/History/Details/HistoryDetailsViewTemplate.html

@@ -43,6 +43,10 @@
                                 <dt>Download Client ID:</dt>
                                 <dd>{{downloadClientId}}</dd>
                             {{/if}}
+
+                            {{#if age}}
+                                {{historyAge}}
+                            {{/if}}
                         {{/with}}
                     </dl>
                 {{/if_eq}}