Add maintenance banner on UI (#797)

* fix bug on email separator

Signed-off-by: Denis barbaron <denis.barbaron@orange.com>

* allow group name change

Signed-off-by: Denis barbaron <denis.barbaron@orange.com>

* add maintenance banner on UI

Signed-off-by: Denis barbaron <denis.barbaron@orange.com>

* removes unnecessary comments

Signed-off-by: Denis barbaron <denis.barbaron@orange.com>

---------

Signed-off-by: Denis barbaron <denis.barbaron@orange.com>

lib/units/groups-engine/watchers/users.js

@@ -1,5 +1,5 @@
 /**
-* Copyright © 2019 code initially contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
+* Copyright © 2019-2024 code initially contributed by Orange SA, authors: Denis Barbaron - Licensed under the Apache license 2.0
 **/
 
 const timeutil = require('../../../util/timeutil')
@@ -33,8 +33,9 @@ module.exports = function(pushdev) {
       'email'
     , 'name'
     , 'privilege'
-    , {groups: ['quotas', 'subscribed']
-    })
+    , {groups: ['quotas', 'subscribed']}
+    , {settings: ['alertMessage']}
+    )
     .changes(), function(err, cursor) {
     if (err) {
       throw err
@@ -77,6 +78,11 @@ module.exports = function(pushdev) {
           !_.isEqual(data.new_val.groups.subscribed, data.old_val.groups.subscribed)) {
           targets.push('settings')
         }
+        else if (!_.isEqual(
+               data.new_val.settings.alertMessage
+             , data.old_val.settings.alertMessage)) {
+          targets.push('menu')
+        }
         if (targets.length) {
           sendUserChange(
             data.new_val