diff --git a/src/classes/Utils/L10n.php b/src/classes/Utils/L10n.php
index 5439d18..96de65b 100644
--- a/src/classes/Utils/L10n.php
+++ b/src/classes/Utils/L10n.php
@@ -10,6 +10,9 @@ use Gettext\Translator;
  */
 class L10n
 {
+	const DECIMAL = 1;
+	const PERCENT = 2;
+
 	public static $languages = [
 		'af' => 'Afrikaans',
 		'ak' => 'Akan',
@@ -80,6 +83,7 @@ class L10n
 		'ks' => 'کٲشُر',
 		'kw' => 'Kernewek',
 		'ky' => 'Кыргызча',
+		'la' => 'Lingua Latina',
 		'lb' => 'Lëtzebuergesch',
 		'lg' => 'Luganda',
 		'ln' => 'Lingála',
@@ -150,16 +154,62 @@ class L10n
 		'zu' => 'Isizulu',
 	];
 
-	public static function langToString($lang)
+	public static function localeToLanguageString($locale)
 	{
-		$found = false;
+		$lang = substr($locale, 0, 2);
+
+		$foundLocale = false;
+		$foundLang = false;
 		foreach(self::$languages as $key => $language) {
-			if (strtolower($key) == strtolower(str_replace('-', '_', $lang))) {
-				$found = true;
+			if (strtolower($key) == strtolower($lang)) {
+				$foundLang = $language;
+			}
+			if (strtolower($key) == strtolower(str_replace('-', '_', $locale))) {
+				$foundLocale = true;
 				break;
 			}
 		}
 
-		return $found ? $language : $lang;
+		return $foundLocale ? $language : $foundLang ?: $locale;
+	}
+
+	/**
+	 * @param float|int $number
+	 * @param int       $style
+	 * @return string
+	 */
+	public static function formatNumber($number, $style = self::DECIMAL)
+	{
+		$locale = localeconv();
+
+		switch($style) {
+			case self::PERCENT:
+				$number *= 100;
+
+				if (\intval($number) == $number) {
+					$decimals = 0;
+				} else {
+					$decimals = 2;
+				}
+
+				$return = number_format($number, $decimals,
+					$locale['decimal_point'],
+					$locale['thousands_sep']) . '%';
+				break;
+			case self::DECIMAL:
+			default:
+				if (\intval($number) == $number) {
+					$decimals = 0;
+				} else {
+					$decimals = 2;
+				}
+
+				$return = number_format($number, $decimals,
+					$locale['decimal_point'],
+					$locale['thousands_sep']);
+				break;
+		}
+
+		return $return;
 	}
 }
diff --git a/src/middleware.php b/src/middleware.php
index dc000a9..ce41504 100644
--- a/src/middleware.php
+++ b/src/middleware.php
@@ -14,6 +14,12 @@ $middleware = new LocalizationMiddleware(
 );
 
 $middleware->setLocaleCallback(function (string $locale) use ($container) {
+	setlocale(LC_ALL, $locale);
+	setlocale(LC_ALL, $locale . '.utf8');
+	setlocale(LC_ALL, $locale . '.UTF8');
+	setlocale(LC_ALL, $locale . '.utf-8');
+	setlocale(LC_ALL, $locale . '.UTF-8');
+
 	$langPath = $container->get('settings')['i18n']['path'];
 
 	$translator = $container->get('l10n');
@@ -27,11 +33,19 @@ $middleware->setLocaleCallback(function (string $locale) use ($container) {
 
 		$translator->loadDomain('strings', $langPath);
 	} else {
+		$lang = substr($locale, 0, 2);
+
 		/** @var $translator \Gettext\Translator */
 		if (file_exists($langPath . '/' . $locale . '/LC_MESSAGES/strings.mo')) {
 			$translator->loadTranslations(Gettext\Translations::fromMoFile($langPath . '/' . $locale . '/LC_MESSAGES/strings.mo'));
 		} elseif (file_exists($langPath . '/' . $locale . '/LC_MESSAGES/strings.po')) {
 			$translator->loadTranslations(Gettext\Translations::fromPoFile($langPath . '/' . $locale . '/LC_MESSAGES/strings.po'));
+		} elseif (file_exists($langPath . '/' . $lang . '/LC_MESSAGES/strings.mo')) {
+			// Defaulting to language superset
+			$translator->loadTranslations(Gettext\Translations::fromMoFile($langPath . '/' . $lang . '/LC_MESSAGES/strings.mo'));
+		} elseif (file_exists($langPath . '/' . $lang . '/LC_MESSAGES/strings.po')) {
+			// Defaulting to language superset
+			$translator->loadTranslations(Gettext\Translations::fromPoFile($langPath . '/' . $lang . '/LC_MESSAGES/strings.po'));
 		}
 	}
 });
diff --git a/src/settings.php b/src/settings.php
index c5e28fa..3f47a25 100644
--- a/src/settings.php
+++ b/src/settings.php
@@ -19,8 +19,8 @@ $settings = [
 	'displayErrorDetails' => false, // set to false in production
 	'addContentLengthHeader' => false, // Allow the web server to send the content-length header
 	'i18n' => [
-		'locales' => ['en', 'fr', 'cs'],
-		'default' => 'en',
+		'locales' => ['en_US', 'fr_FR', 'cs_CZ'],
+		'default' => 'en_US',
 		'path' => __DIR__ . '/lang'
 	],
 	// Escaper settings
diff --git a/src/templates/layout.phtml b/src/templates/layout.phtml
index 8b9108a..54a08d9 100644
--- a/src/templates/layout.phtml
+++ b/src/templates/layout.phtml
@@ -67,7 +67,7 @@
                         <div class="dropdown-menu" aria-labelledby="languageDropdown">
                     <?php foreach($languages as $lang):?>
                             <a class="dropdown-item" href="?lang=<?php echo $this->escapeUrl($lang)?>">
-	                            <?php echo $this->e(Friendica\Directory\Utils\L10n::langToString($lang)) ?>
+	                            <?php echo $this->e(Friendica\Directory\Utils\L10n::localeToLanguageString($lang)) ?>
                             </a>
                     <?php endforeach;?>
                         </div>
diff --git a/src/templates/sub/profile.phtml b/src/templates/sub/profile.phtml
index 032b761..2dcbc1e 100644
--- a/src/templates/sub/profile.phtml
+++ b/src/templates/sub/profile.phtml
@@ -45,7 +45,7 @@ if (!empty($profile['country'])) {
 	<?php if ($profile['language']):?>
     <div class="language">
         <i class="fa fa-language" alt="<?php echo $this->__('Language')?>" title="<?php echo $this->__('Language')?>"></i>
-        <?php echo $this->e(Friendica\Directory\Utils\L10n::langToString($profile['language'])) ?>
+        <?php echo $this->e(Friendica\Directory\Utils\L10n::localeToLanguageString($profile['language'])) ?>
         <a href="/search?field=language&amp;q=<?php echo $this->escapeUrl($profile['language']) ?>">
             <i class="fa fa-filter" title="<?php echo $this->__('Filter by language')?>"></i>
         </a>
diff --git a/src/templates/sub/server.phtml b/src/templates/sub/server.phtml
index 766a0e7..f8adf0c 100644
--- a/src/templates/sub/server.phtml
+++ b/src/templates/sub/server.phtml
@@ -43,7 +43,7 @@ $base_url_display = substr($base_url, strpos($base_url, '/') + 2);
             <?php if ($server['language']):?>
                 <span class="badge badge-secondary" title="<?php echo $this->__('Default Language')?>">
                     <i class="fa fa-language" alt="<?php echo $this->__('Default Language')?>"></i>
-                    <?php echo $this->e(Friendica\Directory\Utils\L10n::langToString($server['language'])) ?>
+                    <?php echo $this->e(Friendica\Directory\Utils\L10n::localeToLanguageString($server['language'])) ?>
                 </span>
             <?php endif;?>
                 <span class="badge badge-secondary" title="<?php echo $this->__('Known Users')?>">
diff --git a/src/templates/widget/popularlanguages.phtml b/src/templates/widget/popularlanguages.phtml
index 5c06216..15fa128 100644
--- a/src/templates/widget/popularlanguages.phtml
+++ b/src/templates/widget/popularlanguages.phtml
@@ -4,7 +4,7 @@
 		<?php foreach ($languages as $language): ?>
             <li>
                 <a href="search?field=language&q=<?php echo $this->escapeUrl($language['language']) ?>">
-					<?php echo $this->e(Friendica\Directory\Utils\L10n::langToString($language['language'])) ?>
+					<?php echo $this->e(Friendica\Directory\Utils\L10n::localeToLanguageString($language['language'])) ?>
                 </a>
             </li>
 		<?php endforeach; ?>