Commented Issue: Unobtrusive validation attributes are double-encoded [1198]

For example:

```html
data-val-equalto="'MyProperty5' and 'MyProperty4' do not match."
```

There's a method called GetValidationAttributes that adds HTML-encoded values to a dictionary, and then the values are encoded again by TagBuilder.
Comments: This was fixed on v4, I was able to repro on v3.