Add backup details dialog

When a backup contains many apps, displaying them in the main backup
list is confusing and hides most apps

src/views/backups.js

@@ -272,6 +272,15 @@ angular.module('Application').controller('BackupsController', ['$scope', '$locat
         download('cloudron_backup.json', JSON.stringify(tmp));
     };
 
+    $scope.backupDetails = {
+        backup: null,
+
+        show: function (backup) {
+            $scope.backupDetails.backup = backup;
+            $('#backupDetailsModal').modal('show');
+        }
+    };
+
     $scope.configureScheduleAndRetention = {
         busy: false,
         error: {},