diff --git a/README.md b/README.md
index 3ec9758..f4bb8f2 100644
--- a/README.md
+++ b/README.md
@@ -47,6 +47,7 @@ The IFM uses the following resources:
     * fileinfo
     * json
     * ldap (only if LDAP based authentication is used)
+    * mbstring
     * openssl (for remote uploads from https sources)
     * phar
     * posix
diff --git a/compiler.php b/compiler.php
index 25d1888..c90a351 100755
--- a/compiler.php
+++ b/compiler.php
@@ -37,7 +37,11 @@ foreach ($options as $key => $value)
 	if (substr($key, 0, 4) == "lang")
 		$langs = array_merge($langs, explode(",", $value));
 $langs = array_unique($langs);
-$vars['default_lang'] = ($langs[0] == "all") ? "en" : $langs[0];
+if (!empty($langs)) {
+	$vars['default_lang'] = ($langs[0] == "all") ? "en" : $langs[0];
+} else {
+	$vars['default_lang'] = "en";
+}
 // ensure english is available, as it gets merged with the other languages
 // in case of missing keys in other languages.
 if (!in_array("all", $langs) || !in_array("en", $langs))
@@ -45,7 +49,7 @@ if (!in_array("all", $langs) || !in_array("en", $langs))
 
 if (in_array("all", $langs))
 	$langs = array_map(
-		function($i) { return str_replace("src/i18n/", "", str_replace(".json", "", $i)); },
+		function($lang_file) {return pathinfo($lang_file)['filename']; },
 		glob("src/i18n/*.json")
 	);