Today it's impossible to fully localize the view models / validations without using hacks or clutter the view models with the ErrorResourceName etc.

It would be a lot easier to handle localization if you created an extension point where one could register custom string providers.

Something like:

LocalizationStringProvider.Clear();
LocalizationStringProvider.Add(new MySqlProvider());

Full description: http://blog.gauffin.org/2013/01/better-support-for-localization-in-asp-net/