Upload the 012 Ps Multi Languages folder to the plugins directory in your WordPress installation
You can Sample file from (_config.php), to add the multilingual and rename from _config.php to config.php( if multi site can config-$blog_id.php )
make dir 012-m17n-config in /wp-content/ and move setting files to /wp-content/012-m17n-config/config
※priority is hight of /wp-content/012-m17n-config/setting files
Go to plugins list and activate "012 Ps Multi Languages".
Requires: 3.3.x or higher Compatible up to: 3.4.2 Last Updated: 2012-12-31 Downloads: 20,587