diff --git a/calendar/locales/en-US/chrome/calendar/aboutDialog.dtd b/calendar/locales/en-US/chrome/calendar/aboutDialog.dtd
new file mode 100644
index 00000000000..0aa64771dd0
--- /dev/null
+++ b/calendar/locales/en-US/chrome/calendar/aboutDialog.dtd
@@ -0,0 +1,76 @@
+<!-- -*- Mode: HTML; tab-width: 20; indent-tabs-mode: nil; c-basic-offset: 2 -*-
+   - ***** BEGIN LICENSE BLOCK *****
+   - Version: MPL 1.1/GPL 2.0/LGPL 2.1
+   -
+   - The contents of this file are subject to the Mozilla Public License
+   - Version 1.1 (the "License"); you may not use this file except in
+   - compliance with the License. You may obtain a copy of the License at
+   - http://www.mozilla.org/MPL/
+   -
+   - Software distributed under the License is distributed on an "AS IS" basis,
+   - WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
+   - for the specific language governing rights and limitations under the
+   - License.
+   -
+   - The Original Code is Mozilla Firefox about dialog.
+   -
+   - The Initial Developer of the Original Code is 
+   - Blake Ross (blaker@netscape.com).
+   - Portions created by the Initial Developer are Copyright (C) 2002
+   - the Initial Developer. All Rights Reserved.
+   -
+   - Contributor(s): Matthew Willis <mattwillis@gmail.com>
+   -
+   - Alternatively, the contents of this file may be used under the terms of
+   - either the GNU General Public License Version 2 or later (the "GPL"), or
+   - the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
+   - in which case the provisions of the GPL or the LGPL are applicable instead
+   - of those above. If you wish to allow use of your version of this file only
+   - under the terms of either the GPL or the LGPL, and not to allow others to
+   - use your version of this file under the terms of the MPL, indicate your
+   - decision by deleting the provisions above and replace them with the notice
+   - and other provisions required by the LGPL or the GPL. If you do not delete
+   - the provisions above, a recipient may use your version of this file under
+   - the terms of any one of the MPL, the GPL or the LGPL.
+   -
+   - ***** END LICENSE BLOCK ***** -->
+
+<!ENTITY aboutDialog.title      "About &brandFullName;">
+<!ENTITY copyright              "Credits">
+<!ENTITY aboutLink              "&lt; About &brandFullName;">
+<!ENTITY aboutVersion           "version">
+<!ENTITY copyrightText          "&#169;1998-2005 Contributors. All rights
+                                 reserved. Mozilla Sunbird, Sunbird, and the
+                                 Sunbird logos are trademarks of the Mozilla
+                                 Foundation. All rights reserved.">
+
+<!ENTITY brandMotto       "it's about time">
+<!ENTITY credit.leads     "Engineering Leads">
+<!ENTITY credit.core      "Core Development Team">
+<!ENTITY credit.gecko     "Gecko Layout Engine">
+<!ENTITY credit.thanks    "Special Thanks To">
+
+<!-- localization credits look like this: -->
+<!--
+<!ENTITY credit.translation
+  "<h3>Translators</h3><ul><li>Name Here</li></ul>">
+-->
+<!ENTITY credit.translation "">
+
+<!ENTITY credit.visuals     "Visual Design Coordinator">
+<!ENTITY credit.theme       "Theme Design">
+<!ENTITY credit.brand       "Brand Identity">
+<!ENTITY credit.web         "Web Design">
+<!ENTITY credit.update      "Mozilla Update">
+<!ENTITY credit.qalead      "Quality Assurance Lead">
+<!ENTITY credit.qa          "Quality Assurance">
+<!ENTITY credit.build       "Build and Release">
+<!ENTITY credit.infra       "Infrastructure Support">
+<!ENTITY credit.support     "Support Resources">
+<!ENTITY credit.manage      "Project Management">
+<!ENTITY credit.marketleads "Marketing Leads">
+<!ENTITY credit.market      "Marketing">
+<!ENTITY credit.creators    "Created By">
+<!ENTITY credit.memory      "In Fond Memory Of">
+<!ENTITY credit.powered     "Powered by">
+