In wp-config.php

define( ‘WP_ALLOW_MULTISITE’, TRUE );

Then go to Tools/Network Setup, use Sub-directories or Sub-domains

Than wordpress will provide you the code for wp-config.php and .htaccess file

Put that code in those files.

http://make.marketpress.com/multilingualpress/2014/02/how-to-install-multi-site/

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