you will need to change the names of the form elements and the validation referance.
For example, for the contact name, change teh form element:
<input name="Contact_Name" type="text" class="inputValue" id="Contact_Name" onblur="if (document.getElementById('nameServerError')) document.getElementById('nameServerError').style.display='none'" value="<?php echo(ValidatedField("contact","Contact_Name")) ?>" />
to:
<input name="Nombre_y_Apellido" type="text" class="inputValue" id="Contact_Name" onblur="if (document.getElementById('nameServerError')) document.getElementById('nameServerError').style.display='none'" value="<?php echo(ValidatedField("contact","Nombre_y_Apellido")) ?>" />
and change the validation code:
$WAFV_Errors .= WAValidateRQ(((isset($_POST["Contact_Name"]))?$_POST["Contact_Name"]:"") . "",true,1);
to:
$WAFV_Errors .= WAValidateRQ(((isset($_POST["Nombre_y_Apellido"]))?$_POST["Nombre_y_Apellido"]:"") . "",true,1);