This sample project shows how to localize the HTML5 report designer. To select localization, it is enough to set the path to the localization XML file as the value of the Localization property. This can be done on the ASPX page or in the Page_Load() event:
<cc1:StiWebDesigner ID="StiWebDesigner1" runat="server" Localization="Localization/en.xml" />
protected void Page_Load(object sender, EventArgs e)
{
	StiWebDesigner1.Localization = "Localization/en.xml"; 
}

In the example below we added the list of localizations. All the XML files are in the Localization folder of the Web project. After selecting you can display the designer with the specified localization:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Default.aspx.cs" Inherits="Localizing_the_Designer.Default" %>

<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
	<title>Localizing the Designer</title>
</head>
<body>
	<form id="form1" runat="server">
	<div>
		<h2><span style="color: #0066ff">Localizing Designer Example</span></h2>
		<h3>This sample demonstrates how to localize the report designer</h3>
		<asp:DropDownList ID="DropDownListLang" runat="server">
			<asp:ListItem Value="ar">Arabic</asp:ListItem>
			<asp:ListItem Value="be">Belarusian</asp:ListItem>
			<asp:ListItem Value="bg">Bulgarian</asp:ListItem>
			<asp:ListItem Value="ca-ES">Catalan</asp:ListItem>
			<asp:ListItem Value="cs">Czech</asp:ListItem>
			<asp:ListItem Value="de">Deutsch</asp:ListItem>
			<asp:ListItem Value="el-GR">Greek</asp:ListItem>
			<asp:ListItem Value="en-GB">English (UK)</asp:ListItem>
			<asp:ListItem Value="en" Selected="True">English</asp:ListItem>
			<asp:ListItem Value="es">Spanish</asp:ListItem>
			<asp:ListItem Value="eu-ES">Basque</asp:ListItem>
			<asp:ListItem Value="fa">Farsi</asp:ListItem>
			<asp:ListItem Value="fr">French</asp:ListItem>
			<asp:ListItem Value="gl-ES">Galician</asp:ListItem>
			<asp:ListItem Value="hr">Croatian</asp:ListItem>
			<asp:ListItem Value="hu">Hungarian</asp:ListItem>
			<asp:ListItem Value="id">Indonesian</asp:ListItem>
			<asp:ListItem Value="it">Italian</asp:ListItem>
			<asp:ListItem Value="ka">Georgian</asp:ListItem>
			<asp:ListItem Value="Lt-sr-SP">Serbian (Latin)</asp:ListItem>
			<asp:ListItem Value="lt">Lithuanian</asp:ListItem>
			<asp:ListItem Value="nb-NO">Norwegian (Bokmål)</asp:ListItem>
			<asp:ListItem Value="nl">Dutch</asp:ListItem>
			<asp:ListItem Value="pl">Polish</asp:ListItem>
			<asp:ListItem Value="pt-BR">Portugese (Brazil)</asp:ListItem>
			<asp:ListItem Value="pt">Portuguese</asp:ListItem>
			<asp:ListItem Value="ro">Romanian</asp:ListItem>
			<asp:ListItem Value="ru">Russian</asp:ListItem>
			<asp:ListItem Value="sk">Slovak</asp:ListItem>
			<asp:ListItem Value="sv">Swedish</asp:ListItem>
			<asp:ListItem Value="tr">Turkish</asp:ListItem>
			<asp:ListItem Value="ua">Ukrainian</asp:ListItem>
			<asp:ListItem Value="zh-CHS">Chinese (Simplified)</asp:ListItem>
			<asp:ListItem Value="zh-CHT">Chinese (Traditional)</asp:ListItem>
		</asp:DropDownList>
		<asp:Button ID="ButtonShowDesigner" runat="server" Text="Show Designer" onclick="ButtonShowDesigner_Click" />
	</div>
	</form>
</body>
</html>

The ButtonShowDesigner_Click() event redirects to the Designer.aspx page. On this page, in the Page_Load() event loads the report and applies the selected localization to the HTML5 designer:
protected void Page_Load(object sender, EventArgs e)
{
	var report = new StiReport();
	report.Load(Server.MapPath(@"Reports\Invoice.mrt"));

	StiWebDesigner1.Localization = $"Localization/{Session["lang"]}.xml";
	StiWebDesigner1.Report = report;
}

На скриншоте ниже Вы можете увидеть результат выполнения данного кода:

Localizing the Designer

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