wp multisite plugins problem

Thankyou for answering.
Yes I do,
I have access to the network admin, I install the plugin and activate it, I can see it in admin of the first website http://www.site.com but not in admin of the other website http://english.site.com.

file wp-config.php:

define ('SUNRISE', 'on');
define('MULTISITE', true);
define('SUBDOMAIN_INSTALL', true);
define('DOMAIN_CURRENT_SITE', 'www.site.com');
define('PATH_CURRENT_SITE', '/');
define('SITE_ID_CURRENT_SITE', 1);
define('BLOG_ID_CURRENT_SITE', 1);

htaccess

# BEGIN WordPress
RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [L]
# upload files
RewriteRule ^([_0-9a-zA-Z-]+/)?files/(.+) wp-includes/ms-files.php?file=$2[L]

# add a trailing slash to /wp-admin
RewriteRule ^([_0-9a-zA-Z-]+/)?wp-admin$ $1wp-admin/ [R=301,L]

RewriteCond %{REQUEST_FILENAME} -f [OR]
RewriteCond %{REQUEST_FILENAME} -d
RewriteRule ^ - [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(wp-(content|admin|includes).*) $2 [L]
RewriteRule ^([_0-9a-zA-Z-]+/)?(.*\.php)$ $2 [L]
RewriteRule . index.php [L]
# END WordPress

I install MU Domain mapping, I can add website in domain but in sites=> mapping (empty) nothing.

I check everything several times, I can’t find the problem.

Thank you for answering,

The plugin I instaled is multi-language switcher, it appears in the settings of the main site but not in the sitting of subdomains.

I have tried other plugings that I see in the main site but not in subdomains.
I also tried to put the flags manually on the sites but the theme “enfold” doesn’t allow it.

I’m trying to solve this problem for 10 days, I installed and uninstalled the network several times, changed subdomains in repertory and vice versa.
I havn’t found a topic talking about this problem.

I have exhausted all the solutions.

You are my last hope, even if I never give up 🙂