RadTabStrip provides support for right to left languages.
    
        RadTabStrip considers the direction attribute set to the control itself or any parent
        HTML element. If you set the direction of the body tag (or any other parent element
        that contains the control) to rtl, RadTabStrip reverses the  
        tab order and aligns itself to the right side of the container.
    
    
<telerik:RadTabStrip ID="RadTabStrip1" runat="server" dir="rtl" ... />