I do change for UserMenu.js script to display Database name in cosole my assets file loaded whiteout error but it have no effect on interface , in the flowing my assets file and custom scrip :

<?xml version="1.0" encoding="utf-8"?>
<odoo>
<!--    create an inherited view of the assets bundle, and add the js file to display Datebase name with  For example,-->
  <template id="assets_backend" name="database_name assets" inherit_id="web.assets_backend">
    <xpath expr="//script[last()]" position="after">
        <script type="text/javascript" src="/backend_customization_12/static/src/js/chrome/database.js"></script>
    </xpath>
</template>
</odoo>

javascript module

odoo.define('backend_customization_12.NewHomeMenu', function (require) {
"use strict";

/**
this Js script to inherit HomeMenu widget to  Modifying to dispay database name
 */

var UserMenu = require('web.UserMenu');
var Widget = require('web.Widget');

var NewHomeMenu. = UserMenu.extend({
    template: 'NewHomeMenu',


    start: function () {
        var self = this;
        var session = this.getSession();
        this.$el.on('click', '[data-menu]', function (ev) {
            ev.preventDefault();
            var menu = $(this).data('menu');
            self['_onMenu' + menu.charAt(0).toUpperCase() + menu.slice(1)]();
        });
        return this._super.apply(this, arguments).then(function () {
            var $avatar = self.$('.oe_topbar_avatar');
            if (!session.uid) {
                $avatar.attr('src', $avatar.data('default-src'));
                return $.when();
            }
            var topbar_name = session.name;
//            if (session.debug) {
//                topbar_name = _.str.sprintf("%s (%s)", topbar_name, session.db);
//            }
            topbar_name = _.str.sprintf("%s (%s)", topbar_name, session.db);
            self.$('.oe_topbar_name').text(topbar_name);
            var avatar_src = session.url('/web/image', {
                model:'res.users',
                field: 'image_small',
                id: session.uid,
            });
            $avatar.attr('src', avatar_src);
        });
    },

var dog = new NewHomeMenu();


return dog.start();

});