Add french translation link

Signed-off-by: Bruno Lesieur <bruno.lesieur@gmail.com>

Author: MachinisteWeb

themes/vue/layout/partials/language_dropdown.ejs

@@ -6,5 +6,6 @@
     <li><a href="https://ru.vuejs.org/" class="nav-link" target="_blank">Русский</a></li>
     <li><a href="https://kr.vuejs.org/" class="nav-link" target="_blank">한국어</a></li>
     <li><a href="https://br.vuejs.org/" class="nav-link" target="_blank">Português</a></li>
+    <li><a href="https://fr.vuejs.org/" class="nav-link" target="_blank">Français</a></li>
   </ul>
 </li>