Fixing problem: validation errors ignored on redirects. Closes #476

In conversation on Issue #476, @lucascs asked me to send this PR to start the bug fix.

Here the gist with the problematic controller as he asked me: [Problematic Controller](https://gist.github.com/renanigt/6f88e6fced50bce47ac9)
[off] really doesn't have the meaning you want to put on this sentence. Really translate more like "Sério?" than "Realmente". It's more common to use "True", "Right" or "Sure" in this case. [/off]