fix(docs): correct Hasselhoff spelling, add locale-aware 404 redirect

Fix "Hasslehoff" → "Hasselhoff" typo in customize-bmad.md across all
three locales (en, zh-cn, fr).

Add client-side locale detection to 404.astro so GitHub Pages serves
the correct localized 404 page instead of always showing English.

Co-Authored-By: Claude Opus 4.6 (1M context) <noreply@anthropic.com>

docs/fr/how-to/customize-bmad.md

@@ -84,7 +84,7 @@ Ajouter un contexte persistant que l'agent gardera toujours en mémoire :
 ```yaml
 memories:
   - 'Travaille au Krusty Krab'
-  - 'Célébrité préférée : David Hasslehoff'
+  - 'Célébrité préférée : David Hasselhoff'
   - 'Appris dans l’Epic 1 que ce n’est pas cool de faire semblant que les tests ont passé'
 ```
 

docs/how-to/customize-bmad.md

@@ -85,7 +85,7 @@ Add persistent context the agent will always remember:
 ```yaml
 memories:
   - 'Works at Krusty Krab'
-  - 'Favorite Celebrity: David Hasslehoff'
+  - 'Favorite Celebrity: David Hasselhoff'
   - 'Learned in Epic 1 that it is not cool to just pretend that tests have passed'
 ```
 

docs/zh-cn/how-to/customize-bmad.md

@@ -85,7 +85,7 @@ persona:
 ```yaml
 memories:
   - 'Works at Krusty Krab'
-  - 'Favorite Celebrity: David Hasslehoff'
+  - 'Favorite Celebrity: David Hasselhoff'
   - 'Learned in Epic 1 that it is not cool to just pretend that tests have passed'
 ```
 

website/src/pages/404.astro

@@ -9,3 +9,19 @@ const { Content } = await entry.render();
 <StarlightPage frontmatter={{ title: entry.data.title, template: entry.data.template }}>
   <Content />
 </StarlightPage>
+
+<!-- GitHub Pages serves this single 404.html for all paths.
+     Redirect to the locale-specific 404 page when the URL has a locale prefix. -->
+<script is:inline>
+  (function () {
+    var locales = ['zh-cn', 'fr'];
+    var path = window.location.pathname;
+    for (var i = 0; i < locales.length; i++) {
+      var prefix = '/' + locales[i] + '/';
+      if (path.startsWith(prefix) && path !== prefix + '404/') {
+        window.location.replace(prefix + '404/');
+        return;
+      }
+    }
+  })();
+</script>