Steps to reproduce the issue

Hello Everyone,

I need help with these 2 kinds of problem:

1. I have two languages which are Italian and English and I created two menus for each (register & login) to get the alias in URL.
   https://www.ingrossoborseonline.com/it/registrati
   https://www.ingrossoborseonline.com/en/register
   ...

When I registered on the website in the Italian version of the webpage which is , I will get the confirmation email and receive something like "https://www.ingrossoborseonline.com/it/component/users/?task=registration.activate&token=f5d455188e4d75c6c21f98f783e35ce8&Itemid=122", the URL will redirect to https://www.ingrossoborseonline.com/it/registratilayout?=complete, so okay, everything going right (a problem will discuss to the part 2), But if I registered with the English version, giving the confirmation URL is "https://www.ingrossoborseonline.com/en/component/users/?task=registration.activate&token=a01453557b8f775895e5cb19576bd781&Itemid=123" with /en which is great, but it will redirect to "https://www.ingrossoborseonline.com/en/registrati" (no sense... Italian and English), so it will get a 404 error, for now, I did a manual redirection to https://www.ingrossoborseonline.com/en/register for resolving this problem and surprisingly get a no English message...

2. The normal redirection is to https://www.ingrossoborseonline.com/it/ ... t=complete[/b] which I get a JSON message I think it is... same as https://www.ingrossoborseonline.com/en/ ... t-complete

Menu structure:

Thank you to everyone, if it can resolve this big problem...

Expected result

Normal Redirection and normal message with the actual language message.
No white screen.

System information (as much as possible)

 
PHP | Linux webd014.cluster023.gra.hosting.ovh.net 4.14.66-ovh-vps-grsec-zfs-classid #1 SMP Thu Aug 23 15:15:40 CEST 2018 x86_64
Database Type | mysql
Versione database | 5.6.39-log
Collation database | latin1_swedish_ci
Collation connessione database | utf8mb4_general_ci
Versione PHP | 7.2.14
Web Server | Apache
WebServer interfaccia PHP | fpm-fcgi
Versione di Joomla! | Joomla! 3.9.4 Stable [ Amani ] 12-March-2019 15:00 GMT
Versione piattaforma Joomla! | Joomla Platform 13.1.0 Stable [ Curiosity ] 24-Apr-2013 00:00 GMT
User Agent | Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/73.0.3683.75 Safari/537.36

PHP:

Safe Mode | No
Open basedir | Nessuno
Display Errors | No
Short Open Tags | Sì
Caricamento file | Sì
Magic Quotes | No
Register Globals | No
Output Buffering | Sì
Percorso salvataggio sessione | /tmp
Auto start sessione | 0
XML abilitato | Sì
Zlib abilitato | Sì
ZIP nativo abilitato | Sì
Funzioni disabilitate | _dyuweyrj4,_dyuweyrj4r,dl
Mbstring abilitato | Sì
Iconv disponibile | Sì
Maximum Input Variables | 16000

=============
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