Review please!

hola,

i added a constraint "contains_nuts" to the agent contact portlet to filter evil inputs. right now it should check for http(s) inside the text field inputs and should raise an invalid if an url is found.
Can you review the code (test & translations missing), because the spam problem gets serious and is actually easy to fix.
Be careful please, i didn't get my forked version used on my local machine (it always uses version 0.8, no matter what i tried)