Hello Bruno Michels,
You could use a custom user control that will be dropped on your pages. In your control you can detect the current culture by using System.Threading.Thread.CurrentThread.CurrentUICulture;
and set the meta tag creating an instance of HtmlMeta
the Telerik team
Do you want to have your say when we set our development plans?
Do you want to know when a feature you care about is added or when a bug fixed?
Telerik Public Issue Tracking
system and vote to affect the priority of the items