Localization in ASP.NET Core Tabs control

@using Syncfusion.EJ2.Navigations;

@{
    var content0 = "HyperText Markup Language, commonly referred to as HTML, is the standard markup language used to create web " +
            "pages. Along with CSS, and JavaScript, HTML is a cornerstone technology, used by most websites to create visually " +
            "engaging web pages, user interfaces for web applications, and user interfaces for many mobile applications.[1] Web " +
            "browsers can read HTML files and render them into visible or audible web pages. HTML describes the structure of a " +
            "website semantically along with cues for presentation, making it a markup language, rather than a programming language.";

    var content1 = "C# is intended to be a simple, modern, general-purpose, object-oriented programming language. Its development " +
            "team is led by Anders Hejlsberg. The most recent version is C# 5.0, which was released on August 15, 2012.";

    var content2 = "Java is a set of computer software and specifications developed by Sun Microsystems, later acquired by Oracle " +
            "Corporation, that provides a system for developing application software and deploying it in a cross-platform computing " +
            "environment. Java is used in a wide variety of computing platforms from embedded devices and mobile phones to " +
            "enterprise servers and supercomputers. While less common, Java applets run in secure, sandboxed environments to " +
            "provide many features of native applications and can be embedded in HTML pages.";

}

<ejs-tab id="ej2Tab" heightAdjustMode="Auto" locale="fr-BE" showCloseButton="true" >
    <e-tab-tabitems>
        <e-tab-tabitem header="ViewBag.headerText0" content="@content0"></e-tab-tabitem>
        <e-tab-tabitem header="ViewBag.headerText1" content="@content1"></e-tab-tabitem>
        <e-tab-tabitem header="ViewBag.headerText2" content="@content2"></e-tab-tabitem>               
    </e-tab-tabitems>
</ejs-tab>

<script>
    window.onload = function () {
        ej.base.L10n.load({
            'fr-BE': {
                'tab': {'closeButtonTitle': "Fermer"}
            }
        });
    }
</script>

<style>
    #container {
        visibility: hidden;
        max-width: 650px;
    }

    #loader {
        color: #008cff;
        height: 40px;
        left: 45%;
        position: absolute;
        top: 45%;
        width: 30%;
    }

    .e-content .e-item {
        font-size: 12px;
        margin: 10px;
        text-align: justify;
    }
</style>

public ActionResult Index()
{
    ViewBag.headerText0 = new TabHeader { Text = "HTML" };
    ViewBag.headerText1 = new TabHeader { Text = "C Sharp(C#)" };
    ViewBag.headerText2 = new TabHeader { Text = "Java" };
    return View();
}