diff --git a/plugins/c13y_upgrade/language/ja_JP/description.txt b/plugins/c13y_upgrade/language/ja_JP/description.txt
new file mode 100644
index 000000000..b5f0edb7e
--- /dev/null
+++ b/plugins/c13y_upgrade/language/ja_JP/description.txt
@@ -0,0 +1 @@
+Check integrity of upgrades.
\ No newline at end of file
diff --git a/plugins/c13y_upgrade/language/ja_JP/index.php b/plugins/c13y_upgrade/language/ja_JP/index.php
new file mode 100644
index 000000000..17747c927
--- /dev/null
+++ b/plugins/c13y_upgrade/language/ja_JP/index.php
@@ -0,0 +1,30 @@
+<?php
+// +-----------------------------------------------------------------------+
+// | Piwigo - a PHP based picture gallery                                  |
+// +-----------------------------------------------------------------------+
+// | Copyright(C) 2008-2010 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.                                                                  |
+// +-----------------------------------------------------------------------+
+
+// Recursive call
+$url = '../';
+header( 'Request-URI: '.$url );
+header( 'Content-Location: '.$url );
+header( 'Location: '.$url );
+exit();
+?>
diff --git a/plugins/c13y_upgrade/language/ja_JP/plugin.lang.php b/plugins/c13y_upgrade/language/ja_JP/plugin.lang.php
new file mode 100644
index 000000000..f704b6123
--- /dev/null
+++ b/plugins/c13y_upgrade/language/ja_JP/plugin.lang.php
@@ -0,0 +1,30 @@
+<?php
+// +-----------------------------------------------------------------------+
+// | Piwigo - a PHP based picture gallery                                  |
+// +-----------------------------------------------------------------------+
+// | Copyright(C) 2008-2010 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.                                                                  |
+// +-----------------------------------------------------------------------+
+
+$lang['c13y_upgrade_no_anomaly'] = 'アプリケーション・アップグレード後、異常なし、「アップグレード確認」のプラグインは無効化された';
+$lang['c13y_dbl_email_user'] = '同じメールアドレスがあるユーザー';
+$lang['c13y_correction_dbl_email_user'] = '複数のユーザーを削除';
+$lang['c13y_obsolete_plugin'] = '旧プラグイン';
+$lang['c13y_correction_obsolete_plugin'] = '"%s" のプラグインはこのアプリケーションのバージョンに含まれており、アンインストールする必要があります。';
+
+?>