How to localize the title in add_menu_page in WordPress

Question

I have this code which I would like to localize for translation in the plugin I am building. Nothing on line seems to help. My own attempts return errors. Any help?

public function add_admin_pages() {
        //add_submenu_page( string $parent_slug, string $page_title, string $menu_title, string $capability, string $menu_slug, callable $function = '' )
        add_submenu_page( 
            'woocommerce', 
            _e( 'Exporter réservations', 'export-bookings-to-csv' ),
            _e( 'Exporter réservations', 'export-bookings-to-csv' ), 
            'manage_options', 
            'export-bookings-to-csv', 
            array( $this,'export_bookings_to_csv') 
        );
    }

Answer 1

The problem is that you are echoing the translation with _e()

You need to use __() to return the string.

public function add_admin_pages() {
    //add_submenu_page( string $parent_slug, string $page_title, string $menu_title, string $capability, string $menu_slug, callable $function = '' )
    add_submenu_page( 
        'woocommerce', 
        __( 'Exporter réservations', 'export-bookings-to-csv' ),
        __( 'Exporter réservations', 'export-bookings-to-csv' ), 
        'manage_options', 
        'export-bookings-to-csv', 
        array( $this,'export_bookings_to_csv') 
    );
}

You will find details when to use __() or _e() here

$hello = __('Hello', 'txt-domain');
echo __('Hello', 'txt-domain');

echo $hello;

or using _e()

_e('Hello', 'txt-domain');