By default English is the localized language of your WordPress site that can be changed to your native language:
Open your wp-config.php file and add these lines:
define(‘WPLANG’, ”);
define(‘LANGDIR’, ”);
Important: Language translation file (.mo) must be placed in the default location – wp-content/languages (first) and then wp-includes/languages(second). As in the above function, you can define your own language directory. Learn more about WordPress in Your Language