https://bugzilla.wikimedia.org/show_bug.cgi?id=61119
--- Comment #4 from Sorawee Porncharoenwase nullzero.free@gmail.com --- Okay, I further tested many things and found interesting results.
I at first remove pywikibot.lwp. if I run that code, I will get translated message.
Then, I remove pywikibot.lwp. I run site.login(False) and then that code. Now I get untranslated message.
Then, I remove pywikibot.lwp. I run site.login(True) and then that code. I get translated message.
Have no idea at all why this happens.