Fix root active locales

bedrock/base/templates/404-locale.html

@@ -57,7 +57,7 @@ <h1 class="c-simple-header-title">
   <section class="c-block-list">
     <ul>
       {% for locale in available_locales if locale in languages %}
-        <li lang="{{ locale }}"><a href="/{{ locale }}{{ request.path_info }}" title="{{ 'Browse {0} in the {1} language'|f(request.path_info, languages[locale]["native"]) }}">{{ languages[locale]['native'] }}</a></li>
+        <li lang="{{ locale }}"><a href="/{{ locale }}{{ request.path_info }}" title="{{ 'Browse {0} in the {1} language'|f(request.path_info, languages[locale]["English"]) }}">{{ languages[locale]['native'] }}</a></li>
       {% endfor %}
     </ul>
   </section>

lib/l10n_utils/__init__.py

@@ -169,7 +169,9 @@ def render(request, template, context=None, ftl_files=None, activation_files=Non
                 translations.update(ftl_active_locales(af))
             translations = sorted(translations)  # `sorted` returns a list.
         elif l10n:
-            translations = l10n.active_locales
+            translations = l10n.active_locales if not is_root_path_with_no_language_clues(request) else l10n.active_home_locales
+            allowed = settings.PROD_LANGUAGES if not settings.DEV else settings.DEV_LANGUAGES
+            translations = set(translations).intersection(allowed)
 
         # if `add_active_locales` is given then add it to the translations for the template
         if "add_active_locales" in context:

lib/l10n_utils/fluent.py

@@ -84,6 +84,11 @@ def active_locales(self):
         # first resource is the one to check for activation
         return get_active_locales(self.resource_ids[0])
 
+    @cached_property
+    def active_home_locales(self):
+        # use mozorg/home to check for activation
+        return get_active_locales("mozorg/home.ftl")
+
     @cached_property
     def percent_translated(self):
         if not self._message_ids: