Text Property

Another way to localize RadEditor labels, buttons and tooltips is by using the Text property:

protected void Page_Load(object sender, EventArgs e)
{
    if (!IsPostBack)
    {
        Telerik.Web.UI.EditorTool tool = RadEditor1.FindTool("Copy");
        if (tool != null)
        {
            tool.Text = "My Copy Button";
        }
    }
} 

Protected Sub Page_Load(ByVal sender As Object, ByVal e As EventArgs)
    If Not IsPostBack Then
        Dim tool As Telerik.Web.UI.EditorTool = RadEditor1.FindTool("Copy")
        If tool <> Nothing Then
            tool.Text = "My Copy Button"
        End If
    End If
End Sub

You can also set the Text property inline in the RadEditor declaration:

<telerik:RadEditor RenderMode="Lightweight" runat="server" ID="RadEditor1">
   <Tools>
       <telerik:EditorToolGroup>
           <telerik:EditorTool Name="Copy" Text="My copy button" />
           <telerik:EditorTool Name="Bold" Text="My bold button" />
           <telerik:EditorTool Name="Custom" Text="My custom button" />
       </telerik:EditorToolGroup>
   </Tools>
</telerik:RadEditor> 

Order of Precedence

The order of precedence for localization is generally that Text assigned at runtime (in the Page_Load for example) is considered first, then in-line declaration and lastly the resource file strings are the default.For example, if the Language property is set to "fr-FR", the editor tool in-line Text declaration for the "Copy" tool is "My In-Line Copy Button" and the Page_Load event handler includes an assignment "My Runtime Copy Button", the run-time assignment will win out: