fixed spanish language typo in dropdown menu (#2436)

español > Español

Author: Yilber

themes/vue/layout/partials/language_dropdown.ejs

@@ -8,7 +8,7 @@
     <li><a href="https://br.vuejs.org/<%- page.path %>" class="nav-link" target="_blank" rel="noopener">Português</a></li>
     <li><a href="https://fr.vuejs.org/<%- page.path %>" class="nav-link" target="_blank" rel="noopener">Français</a></li>
     <li><a href="https://vi.vuejs.org/<%- page.path %>" class="nav-link" target="_blank" rel="noopener">Tiếng Việt</a></li>
-    <li><a href="https://es.vuejs.org/<%- page.path %>" class="nav-link" target="_blank" rel="noopener">español</a></li>
+    <li><a href="https://es.vuejs.org/<%- page.path %>" class="nav-link" target="_blank" rel="noopener">Español</a></li>
     <li><a href="https://docs.vuejs.id/<%- page.path %>" class="nav-link" target="_blank" rel="noopener">Bahasa Indonesia</a></li>
   </ul>
 </li>