registration: properly expose first_name/last_name into email fake object.

rhodecode/model/user.py

@@ -412,6 +412,10 b' class UserModel(BaseModel):'
             self.sa.flush()
 
             user_data = new_user.get_dict()
+            user_data.update({
+                'first_name': user_data.get('firstname'),
+                'last_name': user_data.get('lastname'),
+            })
             kwargs = {
                 # use SQLALCHEMY safe dump of user data
                 'user': AttributeDict(user_data),