fix some code issues

js/devel/contactlist.js

@@ -35,7 +35,7 @@ var ContactList = new Vue({
 			// Now bind the events when we click on the phone number
 			$.getJSON(Sms.generateURL('/front-api/v1/peerlist'), function (jsondata, status) {
 				// Use a buffer for better jQuery performance
-				var bufferedContacts = [];
+                let bufferedContacts = [];
 
                 Sms.photoVersion = jsondata["photo_version"];
 
@@ -144,10 +144,10 @@ var ContactList = new Vue({
 			$.getJSON(Sms.generateURL('/front-api/v1/new_messages'),
 				{'lastDate': this.lastRetrievedMessageDate},
 				function (jsondata, status) {
-					var bufferedContacts = [];
+                    let bufferedContacts = [];
 
                     $.each(jsondata['phonelist'], function (id, val) {
-						var fn, peerLabel;
+                        let fn, peerLabel;
                         if (typeof jsondata['contacts'][id] === 'undefined') {
 							peerLabel = id;
 						}
@@ -157,7 +157,7 @@ var ContactList = new Vue({
 						}
 
 						if (!inArray(peerLabel, bufferedContacts)) {
-							var contactObj = {
+                            let contactObj = {
                                 'label': peerLabel,
                                 'nav': id,
                                 'unread': parseInt(val)