1. http://codex.wordpress.org/Create_A_Network
2. https://github.com/lloc/Multisite-Language-Switcher/wiki/Plugin-installation-and-activation
REMOVE A MULTI-SITE
Delete any extra sites you may have created. Move the content and users to the main blog or wherever you desire.
Remove the lines we added in the wp-config.php file.
Restore the .htaccess file to the default. One the multisite lines are gone from the config file, you can usually restore these by resaving the permalinks.
Drop these global tables in the database:
wp_blogs
wp_blog_versions
wp_registration_log
wp_signups
wp_site
wp_sitemeta
