Since source code is provided you are free to recompile sign the assembly and deploy it in the GAC. Running from the GAC simplifies a few permission related issues such as using Reflection and resetting the application, but it is not required.
Once you have created the folder use the Resource Provider Configuration in web.config to indicate the virtual path to the administration form. The setting is in the wwDbResourceProvider section. For example:
localizationFormWebPath="~/localizationadmin/localizeform.aspx"
This setting is used by the wwDbResourceControl server control that can be dropped on any ASP.NET form to properly generate the resource editing links to find the admin form and properly navigate to the context sensitive content.
The Administration interface also requires a couple of extra assemblies to provide the AJAX interface and various utility features use by the control forms. To run the admin interface you need:
The controls library is used to provide the AJAX functionality a few other controls to the Administration interface.
There's more information on copying and configuring the resource directory outlined here.
Please note that the sample application also utilizes Westwind.BusinessObjects.dll which is not required for anything but the demos. It won't be required for your own applications.