diff --git a/app/javascript/entrypoints/application.js b/app/javascript/entrypoints/application.js
index f7d7410ea..6e3ec2bc6 100644
--- a/app/javascript/entrypoints/application.js
+++ b/app/javascript/entrypoints/application.js
@@ -65,5 +65,12 @@ Turbo.session.drive = false;
 // Expose globals
 window.DS = window.DS || DS;
 
+// enable legacy mode of DSFR when vite is not detectde as modern browser
+window.addEventListener('load', function () {
+  if (!window.__vite_is_modern_browser) {
+    window.dsfr.internals.legacy.setLegacy();
+  }
+});
+
 import('../shared/track/matomo');
 import('../shared/track/sentry');
diff --git a/config/locales/en.yml b/config/locales/en.yml
index de1196dbf..d277e4111 100644
--- a/config/locales/en.yml
+++ b/config/locales/en.yml
@@ -281,7 +281,7 @@ en:
           check_france_connect_html: Have you once logged in with France Connect? If yes, <a href=\"%{href}\">try again with France Connect</a>.
       shared:
         email_can_take_a_while_html: <strong>Please note</strong> that this message can take up to 15 minutes to arrive.
-        contact_us_if_any_trouble_html: You can contact us <a href=\"%{href}\">through this form</a> if a problem still exists.
+        contact_us_if_any_trouble_html: 'You can contact us <a href="%{href}">through this form</a> if a problem still exists.'
   modal:
     publish:
       title:
diff --git a/config/locales/fr.yml b/config/locales/fr.yml
index 6a0216b80..9c3ce623d 100644
--- a/config/locales/fr.yml
+++ b/config/locales/fr.yml
@@ -279,7 +279,7 @@ fr:
           title: "Lien de réinitialisation du mot de passe envoyé"
       shared:
         email_can_take_a_while_html: "<strong>Attention</strong>, ce message peut mettre jusqu’à <strong>15 minutes</strong> pour arriver."
-        contact_us_if_any_trouble_html: "En cas de difficultés, nous restons joignables <a href=\"%{href}\">via ce formulaire</a>."
+        contact_us_if_any_trouble_html: 'En cas de difficultés, nous restons joignables <a href="%{href}">via ce formulaire</a>.'
   modal:
     publish:
       title: