Edited Issue: How to support AjaxControlToolkit.resources.dll of Vietnamese language? [27251]

I'm using Calendar component of AjaxControlToolkit.dll, it support lots of language resource file(AjaxControlToolkit.resources.dll, please see the attachment), except Vietnamese language. So I try to create an Vietnamese resource library by myself, but it doesn't work. So the issue is how can I support more language resource library?
Any suggestion?

Any help would be appreciated!