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diff --git a/www/wiki/extensions/Translate/utils/TranslationStats.php b/www/wiki/extensions/Translate/utils/TranslationStats.php
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+++ b/www/wiki/extensions/Translate/utils/TranslationStats.php
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+<?php
+/**
+ * Contains class which offers functionality for statistics reporting.
+ *
+ * @file
+ * @author Niklas Laxström
+ * @author Siebrand Mazeland
+ * @copyright Copyright © 2010-2013, Niklas Laxström, Siebrand Mazeland
+ * @license GPL-2.0-or-later
+ */
+
+/**
+ * Contains methods that provide statistics for message groups.
+ *
+ * @ingroup Stats
+ */
+class TranslationStats {
+	/**
+	 * Returns translated percentage for message group in given
+	 * languages
+	 *
+	 * @param string $group Unique key identifying the group
+	 * @param string[] $languages List of language codes
+	 * @param bool|int $threshold Minimum required percentage translated to
+	 * return. Other given language codes will not be returned.
+	 * @param bool $simple Return only codes or code/pecentage pairs
+	 *
+	 * @return (float|string)[] Array of key value pairs code (string)/percentage
+	 * (float) or array of codes, depending on $simple
+	 */
+	public static function getPercentageTranslated( $group, $languages, $threshold = false,
+		$simple = false
+	) {
+		$stats = [];
+
+		$g = MessageGroups::singleton()->getGroup( $group );
+
+		$collection = $g->initCollection( 'en' );
+		foreach ( $languages as $code ) {
+			$collection->resetForNewLanguage( $code );
+			// Initialise messages
+			$collection->filter( 'ignored' );
+			$collection->filter( 'optional' );
+			// Store the count of real messages for later calculation.
+			$total = count( $collection );
+			$collection->filter( 'translated', false );
+			$translated = count( $collection );
+
+			$translatedPercentage = ( $translated * 100 ) / $total;
+			if ( $translatedPercentage >= $threshold ) {
+				if ( $simple ) {
+					$stats[] = $code;
+				} else {
+					$stats[$code] = $translatedPercentage;
+				}
+			}
+		}
+
+		return $stats;
+	}
+}