Change due to language string format change

web/inc/i18n.php

@@ -16,7 +16,7 @@ textdomain($domain);
  * @param string Fallback language (default: 'en')
  * @return string Language code (such as 'en' and 'ja')
  */
-function detect_user_language($fallback='en_US') {
+function detect_user_language($fallback='en') {
     
 }
 

web/inc/mail-wrapper.php

@@ -23,7 +23,7 @@ $data = json_decode(implode('', $output), true);
 if (!empty( $data['config']['LANGUAGE'])) {
     $_SESSION['language'] = $data['config']['LANGUAGE'];
 } else {
-    $_SESSION['language'] = 'en_US';
+    $_SESSION['language'] = 'en';
 }
 
 // Define vars

web/login/index.php

@@ -170,7 +170,7 @@ if (empty($_SESSION['language'])) {
         $_SESSION['language'] = $lang;
     }
     else {
-        $_SESSION['language'] = 'en_US';
+        $_SESSION['language'] = 'en';
     }
 }