Better

i18n/en.yml

@@ -146,6 +146,13 @@ commons:
     PDF: Adobe Portable Document Format
 diplomas:
   type: Type de diplôme
+errors:
+  error_404:
+    title: "404 error"
+    text: >-
+      This link seems incorrect.<br>
+      We suggest you return to the <a href="/">home page of our site</a>.<br>
+      Thank you for your understanding.
 events:
   archives: Previous events archive
   add_to_calendar:
@@ -190,7 +197,6 @@ formats:
   tar: Compressed archive
 organizations:
   logo: Logo
-page_not_found: 404 page not found
 pages:
   details: Details
   informations: Informations

i18n/fr.yml

@@ -146,6 +146,13 @@ commons:
     PDF: Adobe Portable Document Format
 diplomas:
   type: Type de diplôme
+errors:
+  error_404:
+    title: Erreur 404
+    text: >-
+      Ce lien semble erroné.<br>
+      Nous vous proposons de retourner à la <a href="/">page d'accueil de notre site</a>.<br>
+      Merci de votre compréhension. 
 events:
   archives: Accéder aux archives des événements passés
   add_to_calendar:
@@ -190,7 +197,6 @@ formats:
   tar: Compressed archive
 organizations:
   logo: Logo
-page_not_found: 404 page non trouvée
 pages:
   details: En détail
   informations: Informations

layouts/404.html

 {{ define "main" }}
-  {{ $error_message := i18n "page_not_found" }}
+  {{ $title := i18n "errors.error_404.title" }}
   {{ partial "header/hero.html"
         (dict
-          "title" $error_message
+          "title" $title
           "context" .
         )}}
+  <div class="container">
+    <p>
+      {{ safeHTML (i18n "errors.error_404.text") }}
+    </p>
+  </div>
 {{ end }}