Here's a proper multisite solution:

Install WordPress directly on the root of your domain mysite.de. After that, setup a multisite and chose the sub domain option (Yes, subdomain. It's far more flexible but you can use it with subdirectories as well).

WordPress will ask you to update wp-config.php and .htaccess. To the wp-config.php add the following constants (in addition to the one provided by WP)

define( "COOKIEDOMAIN", "" );
define( "ADMIN_COOKIE_PATH", "/" );
define( 'SITECOOKIEPATH', '/' );

Don't use the .htaccess code provided by WordPress but use instead this one:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [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]

Go to the network admin menu and create two sites, one for each language. You will get asked for the site address (subdomain). Just enter de for the German site and en for the English one. After the site has been created, edit it directly. Now you can edit the complete URL. Just set it to http://mysite.de/de and http://mysite.de/en. Do this also for the French site.

Now you have four sites in your network, probably with the following IDs:

1 mysite.de/
2 mysite.de/de
3 mysite.de/en
4 mysite.de/fr

As you don't need the first one, you can leave it just empty. You just don't use it. Manage your content in the other thre sites.

To redirect requests to mysite.de/ add another line to your .htaccess above the others:

RedirectMatch permanent "^/$" http://mysite.de/de

You now have a full functional network of two active sites for your content.

Finally a personal recommendation: There's a free plugin called Multilingual Press that supports this concept of a multilingual setup in a network. Disclamer: I contributed to this plugin before and working for a company that develops this plugin.

Here's a proper multisite solution:

Install WordPress directly on the root of your domain mysite.de. After that, setup a multisite and chose the subdomain option (Yes, subdomain! It's far more flexible and you can use it with subdirectories as well).

WordPress will ask you to update wp-config.php and .htaccess. To the wp-config.php add the following constants (in addition to the one provided by WP)

define( "COOKIEDOMAIN", "" );
define( "ADMIN_COOKIE_PATH", "/" );
define( 'SITECOOKIEPATH', '/' );

Don't use the .htaccess code provided by WordPress but use instead this one:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [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]

Go to the network admin menu and create two sites, one for each language. You will get asked for the site address (subdomain). Just enter de for the German site and en for the English one. After the site has been created, edit it directly. Now you can edit the complete URL. Just set it to http://mysite.de/de and http://mysite.de/en. Do this for the French site as well.

Now you have four sites in your network, probably with the following IDs:

1 mysite.de/
2 mysite.de/de
3 mysite.de/en
4 mysite.de/fr

As you don't need the first one, you can leave it just empty. You just don't use it. Manage your content in the other thre sites.

To redirect requests to mysite.de/ add another line to your .htaccess above the others:

RedirectMatch permanent "^/$" http://mysite.de/de

You now have a full functional network of two active sites for your content.

Finally a personal recommendation: There's a free plugin called Multilingual Press that supports this concept of a multilingual setup in a network. Disclosure: I contributed to this plugin before and working for a company that develops this plugin.

Here's a proper multisite solution:

Install WordPress directly on the root of your domain mysite.de. After that, setup a multisite and chose the sub domain option (Yes, subdomain. It's far more flexible but you can use it with subdirectories as well).

WordPress will ask you to update wp-config.php and .htaccess. To the wp-config.php add the following constants (in addition to the one provided by WP)

define( "COOKIEDOMAIN", "" );
define( "ADMIN_COOKIE_PAHT", "/" );
define( 'SITECOOKIEPATH', '/' );

Don't use the .htaccess code provided by WordPress but use instead this one:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [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]

Go to the network admin menu and create two sites, one for each language. You will get asked for the site address (subdomain). Just enter de for the German site and en for the English one. After the site has been created, edit it directly. Now you can edit the complete URL. Just set it to http://mysite.de/de and http://mysite.de/en. Do this also for the French site.

Now you have four sites in your network, probably with the following IDs:

1 mysite.de/
2 mysite.de/de
3 mysite.de/en
4 mysite.de/fr

As you don't need the first one, you can leave it just empty. You just don't use it. Manage your content in the other thre sites.

To redirect requests to mysite.de/ add another line to your .htaccess above the others:

RedirectMatch permanent "^/$" http://mysite.de/de

You now have a full functional network of two active sites for your content.

Finally a personal recommendation: There's a free plugin called Multilingual Press that supports this concept of a multilingual setup in a network. Disclamer: I contributed to this plugin before and working for a company that develops this plugin.

Here's a proper multisite solution:

Install WordPress directly on the root of your domain mysite.de. After that, setup a multisite and chose the sub domain option (Yes, subdomain. It's far more flexible but you can use it with subdirectories as well).

WordPress will ask you to update wp-config.php and .htaccess. To the wp-config.php add the following constants (in addition to the one provided by WP)

define( "COOKIEDOMAIN", "" );
define( "ADMIN_COOKIE_PATH", "/" );
define( 'SITECOOKIEPATH', '/' );

Don't use the .htaccess code provided by WordPress but use instead this one:

RewriteEngine On
RewriteBase /
RewriteRule ^index\.php$ - [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]

Go to the network admin menu and create two sites, one for each language. You will get asked for the site address (subdomain). Just enter de for the German site and en for the English one. After the site has been created, edit it directly. Now you can edit the complete URL. Just set it to http://mysite.de/de and http://mysite.de/en. Do this also for the French site.

Now you have four sites in your network, probably with the following IDs:

1 mysite.de/
2 mysite.de/de
3 mysite.de/en
4 mysite.de/fr

As you don't need the first one, you can leave it just empty. You just don't use it. Manage your content in the other thre sites.

To redirect requests to mysite.de/ add another line to your .htaccess above the others:

RedirectMatch permanent "^/$" http://mysite.de/de

You now have a full functional network of two active sites for your content.

Finally a personal recommendation: There's a free plugin called Multilingual Press that supports this concept of a multilingual setup in a network. Disclamer: I contributed to this plugin before and working for a company that develops this plugin.