forum_use_terms: Add mceEditor for terms of use text area

(ActionItem2513)

Signed-off-by: Arthur Del Esposte <arthurmde@gmail.com>
Signed-off-by: Carlos Andre <carlos.andre.souza@msn.com>
Signed-off-by: Gabriela Navarro <navarro1703@gmail.com>
forum_use_terms: Add javascript behave for show terms of use textarea field

(ActionItem2513)

Signed-off-by: Fabio Teixeira <fabio1079@gmail.com>
Signed-off-by: Carlos Andre <carlos.andre.souza@msn.com>