Add language switcher and language detection

themes/chill-theme/layouts/partials/shortcodes/carousel.html

@@ -14,8 +14,8 @@ Author: Jeroen van der Schee
     {{ end }}
   </div>
   {{ if gt (len .images) 1 }}
-  <button class="carousel-prev" aria-label="Précédent">&#10094;</button>
-  <button class="carousel-next" aria-label="Suivant">&#10095;</button>
+  <button class="carousel-prev" aria-label="{{ i18n "previous" }}">&#10094;</button>
+  <button class="carousel-next" aria-label="{{ i18n "next" }}">&#10095;</button>
 
   <div class="carousel-dots">
     {{ range $i, $_ := .images }}