diff --git a/tools/translation_analysis.php b/tools/translation_analysis.php
new file mode 100644
index 000000000..bf5bc4120
--- /dev/null
+++ b/tools/translation_analysis.php
@@ -0,0 +1,85 @@
+<?php
+// +-----------------------------------------------------------------------+
+// | Piwigo - a PHP based picture gallery                                  |
+// +-----------------------------------------------------------------------+
+// | Copyright(C) 2008-2009 Piwigo Team                  http://piwigo.org |
+// | Copyright(C) 2003-2008 PhpWebGallery Team    http://phpwebgallery.net |
+// | Copyright(C) 2002-2003 Pierrick LE GALL   http://le-gall.net/pierrick |
+// +-----------------------------------------------------------------------+
+// | This program is free software; you can redistribute it and/or modify  |
+// | it under the terms of the GNU General Public License as published by  |
+// | the Free Software Foundation                                          |
+// |                                                                       |
+// | This program is distributed in the hope that it will be useful, but   |
+// | WITHOUT ANY WARRANTY; without even the implied warranty of            |
+// | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU      |
+// | General Public License for more details.                              |
+// |                                                                       |
+// | You should have received a copy of the GNU General Public License     |
+// | along with this program; if not, write to the Free Software           |
+// | Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, |
+// | USA.                                                                  |
+// +-----------------------------------------------------------------------+
+
+define('PHPWG_ROOT_PATH', '../');
+include_once( PHPWG_ROOT_PATH.'include/common.inc.php' );
+
+$languages = array_keys(get_languages());
+
+$page['ref_compare'] = 'en_UK';
+$page['ref_default_values'] = 'en_UK';
+
+$file_list = array('common', 'admin', 'install', 'upgrade');
+
+$metalang = array();
+
+// preload reference languages
+$metalang[ $page['ref_compare'] ] = load_metalang($page['ref_compare'], $file_list);
+$metalang[ $page['ref_default_values'] ] = load_metalang($page['ref_default_values'], $file_list);
+
+foreach ($languages as $language)
+{
+  if (in_array($language, array($page['ref_compare'], $page['ref_default_values'])))
+  {
+    continue;
+  }
+  echo '<h2>'.$language.'</h2>';
+  $metalang[$language] = load_metalang($language, $file_list);
+
+  foreach ($file_list as $file)
+  {
+    $missing_keys = array_diff(
+      array_keys($metalang[ $page['ref_compare'] ][$file]),
+      array_keys($metalang[ $language ][$file])
+      );
+
+    $output = '';
+    foreach ($missing_keys as $key)
+    {
+      $print_key = str_replace("'", '\\\'', $key);
+      $print_value = str_replace("'", '\\\'', $metalang[ $page['ref_default_values'] ][$file][$key]);
+      $output.= '$'."lang['".$print_key."'] = '".$print_value."';\n";
+    }
+
+    if ('' != $output)
+    {
+      echo '<h3>'.$file.'.lang.php</h3>';
+      echo '<textarea style="width:100%;height:150px;">'.$output.'</textarea>';
+    }
+  }
+}
+
+function load_metalang($language, $file_list)
+{
+  global $lang;
+  
+  $metalang = array();
+  foreach ($file_list as $file)
+  {
+    $lang = array();
+    load_language($file.'.lang', '', array('language'=>$language));
+    $metalang[$file] = $lang;
+  }
+  return $metalang;
+}
+?>
\ No newline at end of file