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diff --git a/www/wiki/includes/TrackingCategories.php b/www/wiki/includes/TrackingCategories.php
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+<?php
+/**
+ * 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; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * 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.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
+ * http://www.gnu.org/copyleft/gpl.html
+ *
+ * @file
+ * @ingroup Categories
+ */
+
+/**
+ * This class performs some operations related to tracking categories, such as creating
+ * a list of all such categories.
+ * @since 1.29
+ */
+class TrackingCategories {
+	/** @var Config */
+	private $config;
+
+	/**
+	 * Tracking categories that exist in core
+	 *
+	 * @var array
+	 */
+	private static $coreTrackingCategories = [
+		'index-category',
+		'noindex-category',
+		'duplicate-args-category',
+		'expensive-parserfunction-category',
+		'post-expand-template-argument-category',
+		'post-expand-template-inclusion-category',
+		'hidden-category-category',
+		'broken-file-category',
+		'node-count-exceeded-category',
+		'expansion-depth-exceeded-category',
+		'restricted-displaytitle-ignored',
+		'deprecated-self-close-category',
+		'template-loop-category',
+	];
+
+	/**
+	 * @param Config $config
+	 */
+	public function __construct( Config $config ) {
+		$this->config = $config;
+	}
+
+	/**
+	 * Read the global and extract title objects from the corresponding messages
+	 * @return array Array( 'msg' => Title, 'cats' => Title[] )
+	 */
+	public function getTrackingCategories() {
+		$categories = array_merge(
+			self::$coreTrackingCategories,
+			ExtensionRegistry::getInstance()->getAttribute( 'TrackingCategories' ),
+			$this->config->get( 'TrackingCategories' ) // deprecated
+		);
+
+		// Only show magic link tracking categories if they are enabled
+		$enableMagicLinks = $this->config->get( 'EnableMagicLinks' );
+		if ( $enableMagicLinks['ISBN'] ) {
+			$categories[] = 'magiclink-tracking-isbn';
+		}
+		if ( $enableMagicLinks['RFC'] ) {
+			$categories[] = 'magiclink-tracking-rfc';
+		}
+		if ( $enableMagicLinks['PMID'] ) {
+			$categories[] = 'magiclink-tracking-pmid';
+		}
+
+		$trackingCategories = [];
+		foreach ( $categories as $catMsg ) {
+			/*
+			 * Check if the tracking category varies by namespace
+			 * Otherwise only pages in the current namespace will be displayed
+			 * If it does vary, show pages considering all namespaces
+			 */
+			$msgObj = wfMessage( $catMsg )->inContentLanguage();
+			$allCats = [];
+			$catMsgTitle = Title::makeTitleSafe( NS_MEDIAWIKI, $catMsg );
+			if ( !$catMsgTitle ) {
+				continue;
+			}
+
+			// Match things like {{NAMESPACE}} and {{NAMESPACENUMBER}}.
+			// False positives are ok, this is just an efficiency shortcut
+			if ( strpos( $msgObj->plain(), '{{' ) !== false ) {
+				$ns = MWNamespace::getValidNamespaces();
+				foreach ( $ns as $namesp ) {
+					$tempTitle = Title::makeTitleSafe( $namesp, $catMsg );
+					if ( !$tempTitle ) {
+						continue;
+					}
+					$catName = $msgObj->title( $tempTitle )->text();
+					# Allow tracking categories to be disabled by setting them to "-"
+					if ( $catName !== '-' ) {
+						$catTitle = Title::makeTitleSafe( NS_CATEGORY, $catName );
+						if ( $catTitle ) {
+							$allCats[] = $catTitle;
+						}
+					}
+				}
+			} else {
+				$catName = $msgObj->text();
+				# Allow tracking categories to be disabled by setting them to "-"
+				if ( $catName !== '-' ) {
+					$catTitle = Title::makeTitleSafe( NS_CATEGORY, $catName );
+					if ( $catTitle ) {
+						$allCats[] = $catTitle;
+					}
+				}
+			}
+			$trackingCategories[$catMsg] = [
+				'cats' => $allCats,
+				'msg' => $catMsgTitle,
+			];
+		}
+
+		return $trackingCategories;
+	}
+}