Place the menu in the <nav> tag in desktop version

app/views/layouts/_header.haml

@@ -8,6 +8,7 @@
 - is_user_context = nav_bar_profile == :user
 - is_search_enabled = [params[:controller] == 'recherche', is_instructeur_context, is_expert_context, is_user_context && current_user.dossiers.count].any?
 %header{ class: ["fr-header", content_for?(:notice_info) && "fr-header__with-notice-info"], role: "banner", "data-controller": "dsfr-header" }
+  %nav{ :role => "navigation", "aria-label" => t('layouts.header.main_menu') }
     .fr-header__body
       .fr-container
         .fr-header__body-row

app/views/layouts/_locale_dropdown.html.haml

@@ -1,4 +1,4 @@
-%nav.fr-translate.fr-nav{ :role => "navigation", title: t('.select_locale') }
+.fr-translate.fr-nav
   .fr-nav__item
     %button.fr-translate__btn.fr-btn{ "aria-controls" => "translate", "aria-expanded" => "false", :title => t('.select_locale') }
       = I18n.locale.upcase