diff --git a/bower.json b/bower.json
index 8c7ffdb..10794c7 100644
--- a/bower.json
+++ b/bower.json
@@ -1,6 +1,7 @@
 {
   "name": "alltube",
   "dependencies": {
-    "opensans-googlefont": "*"
+    "opensans-googlefont": "*",
+    "flag-icon-css": "~2.8.0"
   }
 }
diff --git a/classes/Locale.php b/classes/Locale.php
new file mode 100644
index 0000000..72e84e6
--- /dev/null
+++ b/classes/Locale.php
@@ -0,0 +1,92 @@
+<?php
+/**
+ * Locale class.
+ */
+
+namespace Alltube;
+
+use Teto\HTTP\AcceptLanguage;
+
+/**
+ * Class used to represent locales.
+ */
+class Locale
+{
+    /**
+     * Locale language.
+     *
+     * @var string
+     */
+    private $language;
+
+    /**
+     * Locale region.
+     *
+     * @var string
+     */
+    private $region;
+
+    /**
+     * Locale constructor.
+     *
+     * @param string $locale ISO 15897 code
+     */
+    public function __construct($locale)
+    {
+        $parse = AcceptLanguage::parse($locale);
+        $this->language = $parse[1]['language'];
+        $this->region = $parse[1]['region'];
+    }
+
+    /**
+     * Convert the locale to a string.
+     *
+     * @return string ISO 15897 code
+     */
+    public function __toString()
+    {
+        return $this->getIso15897();
+    }
+
+    /**
+     * Get the full name of the locale.
+     *
+     * @param Locale $displayLocale Locale to get the name in
+     *
+     * @return string
+     */
+    public function getFullName(Locale $displayLocale)
+    {
+        return \Locale::getDisplayName($this->getIso15897(), $displayLocale->getIso15897());
+    }
+
+    /**
+     * Get the ISO 15897 code.
+     *
+     * @return string
+     */
+    public function getIso15897()
+    {
+        return $this->language.'_'.$this->region;
+    }
+
+    /**
+     * Get the BCP 47 code.
+     *
+     * @return string
+     */
+    public function getBcp47()
+    {
+        return $this->language.'-'.$this->region;
+    }
+
+    /**
+     * Get the ISO 3166 code.
+     *
+     * @return string
+     */
+    public function getIso3166()
+    {
+        return strtolower($this->region);
+    }
+}
diff --git a/classes/LocaleManager.php b/classes/LocaleManager.php
index f581bc5..d031dcc 100644
--- a/classes/LocaleManager.php
+++ b/classes/LocaleManager.php
@@ -20,7 +20,7 @@ class LocaleManager
     /**
      * Current locale.
      *
-     * @var string
+     * @var Locale
      */
     private $curLocale;
 
@@ -34,19 +34,22 @@ class LocaleManager
         $session_factory = new \Aura\Session\SessionFactory();
         $session = $session_factory->newInstance($cookies);
         $this->sessionSegment = $session->getSegment('Alltube\LocaleManager');
-        $this->setLocale($this->sessionSegment->get('locale'));
+        $cookieLocale = $this->sessionSegment->get('locale');
+        if (isset($cookieLocale)) {
+            $this->setLocale(new Locale($this->sessionSegment->get('locale')));
+        }
     }
 
     /**
      * Get a list of supported locales.
      *
-     * @return array
+     * @return Locale[]
      */
     public function getSupportedLocales()
     {
         $return = [];
         foreach ($this->supportedLocales as $supportedLocale) {
-            $return[$supportedLocale] = \Locale::getDisplayName($supportedLocale, $this->curLocale);
+            $return[] = new Locale($supportedLocale);
         }
 
         return $return;
@@ -55,7 +58,7 @@ class LocaleManager
     /**
      * Get the current locale.
      *
-     * @return string
+     * @return Locale
      */
     public function getLocale()
     {
@@ -65,9 +68,9 @@ class LocaleManager
     /**
      * Set the current locale.
      *
-     * @param string $locale Locale code.
+     * @param Locale $locale Locale
      */
-    public function setLocale($locale)
+    public function setLocale(Locale $locale)
     {
         putenv('LANG='.$locale);
         setlocale(LC_ALL, [$locale, $locale.'.utf8']);
diff --git a/classes/LocaleMiddleware.php b/classes/LocaleMiddleware.php
index 19593c5..42f3515 100644
--- a/classes/LocaleMiddleware.php
+++ b/classes/LocaleMiddleware.php
@@ -34,7 +34,7 @@ class LocaleMiddleware
      */
     public function testLocale(array $proposedLocale)
     {
-        foreach ($this->locale->getSupportedLocales() as $locale => $name) {
+        foreach ($this->locale->getSupportedLocales() as $locale) {
             $parsedLocale = AcceptLanguage::parse($locale);
             if (isset($proposedLocale['language'])
                 && $parsedLocale[1]['language'] == $proposedLocale['language']
@@ -59,9 +59,13 @@ class LocaleMiddleware
         $headers = $request->getHeader('Accept-Language');
         $curLocale = $this->locale->getLocale();
         if (!isset($curLocale)) {
-            $this->locale->setLocale(
-                AcceptLanguage::detect([$this, 'testLocale'], 'en_US', $headers[0])
-            );
+            if (isset($headers[0])) {
+                $this->locale->setLocale(
+                    AcceptLanguage::detect([$this, 'testLocale'], 'en_US', $headers[0])
+                );
+            } else {
+                $this->locale->setLocale('en_US');
+            }
         }
 
         return $next($request, $response);
diff --git a/controllers/FrontController.php b/controllers/FrontController.php
index 5a2aa16..fb5de9f 100644
--- a/controllers/FrontController.php
+++ b/controllers/FrontController.php
@@ -6,6 +6,7 @@
 namespace Alltube\Controller;
 
 use Alltube\Config;
+use Alltube\Locale;
 use Alltube\PasswordException;
 use Alltube\VideoDownload;
 use Psr\Container\ContainerInterface;
@@ -126,7 +127,7 @@ class FrontController
      */
     public function locale(Request $request, Response $response, array $data)
     {
-        $this->locale->setLocale($data['locale']);
+        $this->locale->setLocale(new Locale($data['locale']));
 
         return $response->withRedirect($this->container->get('router')->pathFor('index'));
     }
diff --git a/templates/inc/head.tpl b/templates/inc/head.tpl
index 3fb8052..8c647d8 100644
--- a/templates/inc/head.tpl
+++ b/templates/inc/head.tpl
@@ -1,6 +1,6 @@
 {locale path="../i18n" domain="Alltube"}
 <!Doctype HTML>
-<html lang="{$locale|replace:'_':'-'}">
+<html lang="{$locale->getBcp47()}">
 <head>
 <meta charset="UTF-8" />
 <meta name=viewport content="width=device-width, initial-scale=1">
@@ -10,6 +10,7 @@
     <meta property="og:description" content="{$description|escape}" />
 {/if}
 <link rel="stylesheet" href="{base_url}/dist/main.css" />
+<link rel="stylesheet" href="{base_url}/bower_components/flag-icon-css/css/flag-icon.min.css" />
 <title>AllTube Download{if isset($title)} - {$title|escape}{/if}</title>
 <link rel="canonical" href="{$canonical}" />
 <link rel="icon" href="{base_url}/img/favicon.png" />
diff --git a/templates/inc/header.tpl b/templates/inc/header.tpl
index a978372..71f24d2 100644
--- a/templates/inc/header.tpl
+++ b/templates/inc/header.tpl
@@ -6,8 +6,8 @@
     </div>
     <ul class="locales">
         {if isset($locales)}
-            {foreach $locales as $locale=>$name}
-                <li><a href="{path_for name='locale' data=['locale'=>$locale]}">{$name}</a></li>
+            {foreach $locales as $supportedLocale}
+                <li><a href="{path_for name='locale' data=['locale'=>$supportedLocale->getIso15897()]}"><span class="flag-icon flag-icon-{$supportedLocale->getIso3166()}"></span> {$supportedLocale->getFullName($locale)}</a></li>
             {/foreach}
         {/if}
     </ul>