Login to web site

[snippsat]

I don't understand the issue related to the "submit" into the data.

Have to look what send as Form Data as mention bye @stranac.
submit is not send,but language is.
Try:

import time
import requests
from lxml import html
from bs4 import BeautifulSoup

headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/68.0.3440.106 Safari/537.36'}
params = {'j_username': 'myusername', 'j_password': 'mypassword', 'language': 'it'}
login_url = "https://ec.gbgroup.it/orderentry/login.action"
with requests.Session() as session:
    #For testing purposes is removed the Certificate verification
    result = session.post(login_url, headers=headers, params=params, verify=False)