As for the localization problem, I am not quite sure what the problem might be. For convenience I attached a small sample page to this thread where I have changed the localization strings for the radconfirm dialog, along with a picture of the result in the browser. I hope it will be of help.
Note that you could also create your own template for the confirm dialog and hardcode the strings there - more information on the subject is available in this help article
the Telerik team