add descriptions for snapshot tasks

www/manager/Utils.js

@@ -428,6 +428,9 @@ Ext.define('PVE.Utils', { statics: {
     task_desc_table: {
 	vncproxy: [ 'VM/CT', gettext('Console') ],
 	vncshell: [ '', gettext('Shell') ],
+	qmsnapshot: [ 'VM', gettext('Snapshot') ],
+	qmrollback: [ 'VM', gettext('Rollback') ],
+	qmdelsnapshot: [ 'VM', gettext('Delete Snapshot') ],
 	qmcreate: [ 'VM', gettext('Create') ],
 	qmrestore: [ 'VM', gettext('Restore') ],
 	qmdestroy: [ 'VM', gettext('Destroy') ],