--- a/src/Controller/ConferenceController.php
+++ b/src/Controller/ConferenceController.php
@@ -33,7 +33,7 @@ class ConferenceController extends AbstractController
         $this->bus = $bus;
     }

-    #[Route('/', name: 'homepage')]
+    #[Route('/{_locale}/', name: 'homepage')]
     public function index(ConferenceRepository $conferenceRepository): Response
     {
         $response = new Response($this->twig->render('conference/index.html.twig', [

--- a/src/Controller/ConferenceController.php
+++ b/src/Controller/ConferenceController.php
@@ -33,7 +33,7 @@ class ConferenceController extends AbstractController
         $this->bus = $bus;
     }

-    #[Route('/{_locale}/', name: 'homepage')]
+    #[Route('/{_locale<en|fr>}/', name: 'homepage')]
     public function index(ConferenceRepository $conferenceRepository): Response
     {
         $response = new Response($this->twig->render('conference/index.html.twig', [

--- a/config/services.yaml
+++ b/config/services.yaml
@@ -7,6 +7,7 @@ parameters:
     default_admin_email: [email protected]
     default_domain: '127.0.0.1'
     default_scheme: 'http'
+    app.supported_locales: 'en|fr'

     router.request_context.host: '%env(default:default_domain:SYMFONY_DEFAULT_ROUTE_HOST)%'
     router.request_context.scheme: '%env(default:default_scheme:SYMFONY_DEFAULT_ROUTE_SCHEME)%'
--- a/src/Controller/ConferenceController.php
+++ b/src/Controller/ConferenceController.php
@@ -33,7 +33,7 @@ class ConferenceController extends AbstractController
         $this->bus = $bus;
     }

-    #[Route('/{_locale<en|fr>}/', name: 'homepage')]
+    #[Route('/{_locale<%app.supported_locales%>}/', name: 'homepage')]
     public function index(ConferenceRepository $conferenceRepository): Response
     {
         $response = new Response($this->twig->render('conference/index.html.twig', [

--- a/src/Controller/ConferenceController.php
+++ b/src/Controller/ConferenceController.php
@@ -44,7 +44,7 @@ class ConferenceController extends AbstractController
         return $response;
     }

-    #[Route('/conference_header', name: 'conference_header')]
+    #[Route('/{_locale<%app.supported_locales%>}/conference_header', name: 'conference_header')]
     public function conferenceHeader(ConferenceRepository $conferenceRepository): Response
     {
         $response = new Response($this->twig->render('conference/header.html.twig', [
@@ -55,7 +55,7 @@ class ConferenceController extends AbstractController
         return $response;
     }

-    #[Route('/conference/{slug}', name: 'conference')]
+    #[Route('/{_locale<%app.supported_locales%>}/conference/{slug}', name: 'conference')]
     public function show(Request $request, Conference $conference, CommentRepository $commentRepository, NotifierInterface $notifier, string $photoDir): Response
     {
         $comment = new Comment();

--- a/src/Controller/ConferenceController.php
+++ b/src/Controller/ConferenceController.php
@@ -33,6 +33,12 @@ class ConferenceController extends AbstractController
         $this->bus = $bus;
     }

+    #[Route('/')]
+    public function indexNoLocale(): Response
+    {
+        return $this->redirectToRoute('homepage', ['_locale' => 'en']);
+    }
+
     #[Route('/{_locale<%app.supported_locales%>}/', name: 'homepage')]
     public function index(ConferenceRepository $conferenceRepository): Response
     {

--- a/templates/base.html.twig
+++ b/templates/base.html.twig
@@ -34,6 +34,16 @@
                                     Admin
                                 </a>
                             </li>
+<li class="nav-item dropdown">
+    <a class="nav-link dropdown-toggle" href="#" id="dropdown-language" role="button"
+        data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
+        English
+    </a>
+    <div class="dropdown-menu dropdown-menu-right" aria-labelledby="dropdown-language">
+        <a class="dropdown-item" href="{{ path('homepage', {_locale: 'en'}) }}">English</a>
+        <a class="dropdown-item" href="{{ path('homepage', {_locale: 'fr'}) }}">Français</a>
+    </div>
+</li>
                         </ul>
                     </div>
                 </div>

--- a/templates/base.html.twig
+++ b/templates/base.html.twig
@@ -37,7 +37,7 @@
 <li class="nav-item dropdown">
     <a class="nav-link dropdown-toggle" href="#" id="dropdown-language" role="button"
         data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
-        English
+        {{ app.request.locale|locale_name(app.request.locale) }}
     </a>
     <div class="dropdown-menu dropdown-menu-right" aria-labelledby="dropdown-language">
         <a class="dropdown-item" href="{{ path('homepage', {_locale: 'en'}) }}">English</a>

--- a/templates/base.html.twig
+++ b/templates/base.html.twig
@@ -37,7 +37,7 @@
 <li class="nav-item dropdown">
     <a class="nav-link dropdown-toggle" href="#" id="dropdown-language" role="button"
         data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
-        {{ app.request.locale|locale_name(app.request.locale) }}
+        {{ app.request.locale|locale_name(app.request.locale)|u.title }}
     </a>
     <div class="dropdown-menu dropdown-menu-right" aria-labelledby="dropdown-language">
         <a class="dropdown-item" href="{{ path('homepage', {_locale: 'en'}) }}">English</a>

--- a/templates/base.html.twig
+++ b/templates/base.html.twig
@@ -20,7 +20,7 @@
             <nav class="navbar navbar-expand-xl navbar-light bg-light">
                 <div class="container mt-4 mb-3">
                     <a class="navbar-brand mr-4 pr-2" href="{{ path('homepage') }}">
-                        &#128217; Conference Guestbook
+                        &#128217; {{ 'Conference Guestbook'|trans }}
                     </a>

                     <button class="navbar-toggler border-0" type="button" data-toggle="collapse" data-target="#header-menu" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Show/Hide navigation">
--- a/templates/conference/index.html.twig
+++ b/templates/conference/index.html.twig
@@ -4,7 +4,7 @@

 {% block body %}
     <h2 class="mb-5">
-        Give your feedback!
+        {{ 'Give your feedback!'|trans }}
     </h2>

     {% for row in conferences|batch(4) %}
@@ -21,7 +21,7 @@

                             <a href="{{ path('conference', { slug: conference.slug }) }}"
                                class="btn btn-sm btn-blue stretched-link">
-                                View
+                                {{ 'View'|trans }}
                             </a>
                         </div>
                     </div>

--- a/translations/messages+intl-icu.fr.xlf
+++ b/translations/messages+intl-icu.fr.xlf
@@ -7,15 +7,15 @@
     <body>
       <trans-unit id="LNAVleg" resname="Give your feedback!">
         <source>Give your feedback!</source>
-        <target>__Give your feedback!</target>
+        <target>Donnez votre avis !</target>
       </trans-unit>
       <trans-unit id="3Mg5pAF" resname="View">
         <source>View</source>
-        <target>__View</target>
+        <target>Sélectionner</target>
       </trans-unit>
       <trans-unit id="eOy4.6V" resname="Conference Guestbook">
         <source>Conference Guestbook</source>
-        <target>__Conference Guestbook</target>
+        <target>Livre d'Or pour Conferences</target>
       </trans-unit>
     </body>
   </file>

--- a/templates/conference/show.html.twig
+++ b/templates/conference/show.html.twig
@@ -44,7 +44,7 @@
                         </div>
                     </div>
                 {% endfor %}
-                <div>There are {{ comments|length }} comments.</div>
+                <div>{{ 'nb_of_comments'|trans({count: comments|length}) }}</div>
                 {% if previous >= 0 %}
                     <a href="{{ path('conference', { slug: conference.slug, offset: previous }) }}">Previous</a>
                 {% endif %}

--- a/translations/messages+intl-icu.fr.xlf
+++ b/translations/messages+intl-icu.fr.xlf
@@ -17,6 +17,10 @@
         <source>Conference Guestbook</source>
         <target>Livre d'Or pour Conferences</target>
       </trans-unit>
+      <trans-unit id="Dg2dPd6" resname="nb_of_comments">
+        <source>nb_of_comments</source>
+        <target>{count, plural, =0 {Aucun commentaire.} =1 {1 commentaire.} other {# commentaires.}}</target>
+      </trans-unit>
     </body>
   </file>
 </xliff>

--- a/tests/Controller/ConferenceControllerTest.php
+++ b/tests/Controller/ConferenceControllerTest.php
@@ -11,7 +11,7 @@ class ConferenceControllerTest extends WebTestCase
     public function testIndex()
     {
         $client = static::createClient();
-        $client->request('GET', '/');
+        $client->request('GET', '/en/');

         $this->assertResponseIsSuccessful();
         $this->assertSelectorTextContains('h2', 'Give your feedback');
@@ -20,7 +20,7 @@ class ConferenceControllerTest extends WebTestCase
     public function testCommentSubmission()
     {
         $client = static::createClient();
-        $client->request('GET', '/conference/amsterdam-2019');
+        $client->request('GET', '/en/conference/amsterdam-2019');
         $client->submitForm('Submit', [
             'comment_form[author]' => 'Fabien',
             'comment_form[text]' => 'Some feedback from an automated functional test',
@@ -41,7 +41,7 @@ class ConferenceControllerTest extends WebTestCase
     public function testConferencePage()
     {
         $client = static::createClient();
-        $crawler = $client->request('GET', '/');
+        $crawler = $client->request('GET', '/en/');

         $this->assertCount(2, $crawler->filter('h4'));

@@ -50,6 +50,6 @@ class ConferenceControllerTest extends WebTestCase
         $this->assertPageTitleContains('Amsterdam');
         $this->assertResponseIsSuccessful();
         $this->assertSelectorTextContains('h2', 'Amsterdam 2019');
-        $this->assertSelectorExists('div:contains("There are 1 comments")');
+        $this->assertSelectorExists('div:contains("There is one comment")');
     }
 }