diff --git a/install/mysql/data.sql b/install/mysql/data.sql
index ee6a0cacf3..e9da44c1f4 100644
--- a/install/mysql/data.sql
+++ b/install/mysql/data.sql
@@ -73,7 +73,6 @@ INSERT INTO `extensions` (`extension_id`, `name`, `type`, `element`, `folder`, `
(430, 'plg_system_logout', 'plugin', 'logout', 'system', 0, 1, 1, 1, '', '', '', '', 0, '0000-00-00 00:00:00', 3, 0),
(432, 'plg_user_joomla', 'plugin', 'joomla', 'user', 0, 1, 1, 0, '', '{"strong_passwords":"1","autoregister":"1"}', '', '', 0, '0000-00-00 00:00:00', 2, 0),
(433, 'plg_user_profile', 'plugin', 'profile', 'user', 0, 0, 1, 0, '', '{"register-require_address1":"1","register-require_address2":"1","register-require_city":"1","register-require_region":"1","register-require_country":"1","register-require_postal_code":"1","register-require_phone":"1","register-require_website":"1","register-require_favoritebook":"1","register-require_aboutme":"1","register-require_tos":"1","register-require_dob":"1","profile-require_address1":"1","profile-require_address2":"1","profile-require_city":"1","profile-require_region":"1","profile-require_country":"1","profile-require_postal_code":"1","profile-require_phone":"1","profile-require_website":"1","profile-require_favoritebook":"1","profile-require_aboutme":"1","profile-require_tos":"1","profile-require_dob":"1"}', '', '', 0, '0000-00-00 00:00:00', 0, 0),
-(436, 'plg_system_languagecode', 'plugin', 'languagecode', 'system', 0, 0, 1, 0, '', '', '', '', 0, '0000-00-00 00:00:00', 10, 0),
(449, 'plg_authentication_cookie', 'plugin', 'cookie', 'authentication', 0, 1, 1, 0, '', '', '', '', 0, '0000-00-00 00:00:00', 0, 0),
(506, 'protostar', 'template', 'protostar', '', 0, 1, 1, 0, '', '{"templateColor":"","logoFile":"","googleFont":"1","googleFontName":"Open+Sans","fluidContainer":"0"}', '', '', 0, '0000-00-00 00:00:00', 0, 0),
(507, 'isis', 'template', 'isis', '', 1, 1, 1, 0, '', '{"templateColor":"","logoFile":""}', '', '', 0, '0000-00-00 00:00:00', 0, 0),
diff --git a/lib/plugins/system/languagecode/language/en-GB/en-GB.plg_system_languagecode.ini b/lib/plugins/system/languagecode/language/en-GB/en-GB.plg_system_languagecode.ini
deleted file mode 100644
index d8c39d380d..0000000000
--- a/lib/plugins/system/languagecode/language/en-GB/en-GB.plg_system_languagecode.ini
+++ /dev/null
@@ -1,10 +0,0 @@
-; Joomla! Project
-; Copyright (C) 2005 - 2014 Open Source Matters. All rights reserved.
-; License GNU General Public License version 2 or later; see LICENSE.txt, see LICENSE.php
-; Note : All ini files need to be saved as UTF-8
-
-PLG_SYSTEM_LANGUAGECODE="System - Language Code"
-PLG_SYSTEM_LANGUAGECODE_FIELD_DESC="Changes the language code used for the %s language"
-PLG_SYSTEM_LANGUAGECODE_FIELDSET_DESC="Changes the language code for the generated HTML document. Example of use: One has installed the fr-FR language pack and wants the Search Engines to recognise the page as aimed at French-speaking Canada. Add the tag 'fr-CA' to the corresponding field for 'fr-FR' to resolve this."
-PLG_SYSTEM_LANGUAGECODE_FIELDSET_LABEL="Language codes"
-PLG_SYSTEM_LANGUAGECODE_XML_DESCRIPTION="Provides the ability to change the language code in the generated HTML document to improve SEO.
The fields will appear when the plugin is enabled and saved.
More information at W3.org "
diff --git a/lib/plugins/system/languagecode/language/en-GB/en-GB.plg_system_languagecode.sys.ini b/lib/plugins/system/languagecode/language/en-GB/en-GB.plg_system_languagecode.sys.ini
deleted file mode 100644
index 99825cf268..0000000000
--- a/lib/plugins/system/languagecode/language/en-GB/en-GB.plg_system_languagecode.sys.ini
+++ /dev/null
@@ -1,8 +0,0 @@
-; Joomla! Project
-; Copyright (C) 2005 - 2014 Open Source Matters. All rights reserved.
-; License GNU General Public License version 2 or later; see LICENSE.txt, see LICENSE.php
-; Note : All ini files need to be saved as UTF-8
-
-PLG_SYSTEM_LANGUAGECODE="System - Language Code"
-PLG_SYSTEM_LANGUAGECODE_XML_DESCRIPTION="Provides ability to change the language code in the generated HTML document to improve SEO"
-
diff --git a/lib/plugins/system/languagecode/languagecode.php b/lib/plugins/system/languagecode/languagecode.php
deleted file mode 100644
index 2bbbd2fb21..0000000000
--- a/lib/plugins/system/languagecode/languagecode.php
+++ /dev/null
@@ -1,153 +0,0 @@
- tag.
- *
- * @return void
- *
- * @since 2.5
- */
- public function onAfterRender()
- {
- $app = JFactory::getApplication();
-
- // Use this plugin only in site application.
- if ($app->isSite())
- {
- // Get the response body.
- $body = $app->getBody();
-
- // Get the current language code.
- $code = JFactory::getDocument()->getLanguage();
-
- // Get the new code.
- $new_code = $this->params->get($code);
-
- // Replace the old code by the new code in the