i18n: properly translate the locale dropdown title

app/views/layouts/_locale_dropdown.html.haml

@@ -1,7 +1,7 @@
 .dropdown.locale-dropdown.header-menu-opener
-  %button.button.dropdown-button.icon-only.header-menu-button{ title: "Translate", aria: { expanded: 'false', controls: 'locale_menu' } }
-    .hidden Translate
-    = image_tag "icons/translate-icon.svg", alt: 'Translate', width: 24, height: 24, lazy: true, aria: { hidden: true }
+  %button.button.dropdown-button.icon-only.header-menu-button{ title: t('.languages'), aria: { expanded: 'false', controls: 'locale_menu' } }
+    .hidden t('.languages')
+    = image_tag "icons/translate-icon.svg", alt: t('.languages'), width: 24, height: 24, lazy: true, aria: { hidden: true }
   %ul.header-menu.dropdown-content
     %li
       = link_to save_locale_path(locale: :en), method: :post, class: "menu-item menu-link" do

config/locales/en.yml

@@ -51,6 +51,8 @@ en:
         line1: A simple tool
         line2: to manage dematerialized
         line3: administrative forms.
+    locale_dropdown:
+      languages: "Languages"
   views:
     commencer:
       show:

config/locales/fr.yml

@@ -41,6 +41,8 @@ fr:
         line1: Un outil simple
         line2: pour gérer les formulaires
         line3: administratifs dématérialisés.
+    locale_dropdown:
+      languages: "Langues"
   views:
     commencer:
       show:

spec/features/i18n_spec.rb

@@ -7,8 +7,8 @@ feature 'Accessing the website in different languages:' do
       visit new_user_session_path
       expect(page).to have_text('Connectez-vous')
 
-      click_on 'Translate'
-      click_on 'EN – English'
+      click_on 'Langues'
+      click_on 'English'
 
       # The page is now in English
       expect(page).to have_text('Sign in')