WordPress后台强制使用某种语言

/**
 * Function to force English for the WP backend 
 *
 * @source: answer by Mircea Burdusa on https://www.linkedin.com/grp/post/1482937-6003792331411595265
 */
function so_english_backend( $locale ) {
    if ( is_admin() ) {
        return 'en_US';
    }
    return $locale;
}
add_filter( 'locale', 'so_english_backend' );