[Form & Profiler] Improve error displaying

Q  | A
------------- | -------------
Bug fix?|	no
New feature?|	yes
BC breaks?|	no
Deprecations?|	no
Tests pass?|	yes
Fixed tickets|	~
License|	MIT
Doc PR|

I made this PR, because on huge form, I can't find which field is in error

![The Form Profiler](https://f.cloud.github.com/assets/166890/1993693/7c5698a6-84de-11e3-9240-1d7181e37385.png)