How can I set the radFilter culture dynamically?

I have radFilter.Main.de-DE.resx along with radFilter.Main.resx

But no matter what the culture of the page, it will not read the radFilter.Main.de-DE.resx file unless I explicitly

Set the properties to read that.
does that mean i have to have two web sites - one in english and one in german just to get the filter to read a different resx file?
I tag the page here. i've even got my browser set to german.

<%

@ Page Language="C#" MasterPageFile="~/NOVDarkBlue.Master" AutoEventWireup="true"

CodeBehind="WorkOrdersConsole.aspx.cs" Inherits="NOV.GOLD.WebApp.WorkOrders.WorkOrdersConsole" Culture="auto:en-US" UICulture="auto" %>

and i use a method to set the page culture

protected void InitialzeCulture()

{

string myLang = txtLang.Value;//this is set to de-DE

Thread.CurrentThread.CurrentUICulture = new CultureInfo(myLang);

Thread.CurrentThread.CurrentCulture = CultureInfo.CreateSpecificCulture(myLang);

}

{

background: #fff none;

height: 100%;

height: auto !important;

margin: 0 auto -100px;

min-height: 100%;

padding: 0;

text-align: left;

width: 948px;

}

I have upgraded a project to Q2.  On the development machine, everything runs without issue.  On the production machine, I get an Internal Error 500, which I've tracked down to this section that's been added to the web.config (once deleted, everything works again):

Thanks in advance for anyone's help or input.

Edit -
After troubleshooting on the server, it turns out to be an Error 500.19

It appears that scriptResourceHandler, jsonSerialization, profileService, and authentication are duplicated --

Error Code 0x800700b7
Config Error There is a duplicate 'system.web.extensions/scripting/webServices/jsonSerialization' section defined 

I can make the problem go away by deleting out these three <section name="..."> sections.

I have included the web.config file both before and after the Q2 update.

Before update:

After the update, lots of stuff gets added, including the problem lines at the beginning: