[BUGFIX] The list of extensions is not sorted in Language Packages

The update language package dialog in Extension Manager shows a list of
non-sorted extension keys and does not provide a way to sort them manually.
This makes it hard to find a specific extension.

Change-Id: I791dd173dc0f7da0f05941e2740aca5a49849fc1
Fixes: #31158
Releases: 4.6
Reviewed-on: http://review.typo3.org/6157
Reviewed-by: Georg Ringer
Tested-by: Georg Ringer
Reviewed-by: Xavier Perseguers
Tested-by: Xavier Perseguers

typo3/sysext/em/classes/connection/class.tx_em_connection_extdirectserver.php

@@ -103,7 +103,7 @@ class tx_em_Connection_ExtDirectServer {
 
 
 	/**
-	 * Render local extension list
+	 * Render local extension list, sorted by extension key.
 	 *
 	 * @param object $parameters
 	 * @return array
@@ -136,6 +136,9 @@ class tx_em_Connection_ExtDirectServer {
 			$localList[$value['extkey']]['maxversion'] = tx_em_Tools::versionFromInt($value['maxintversion']);
 		}
 
+			// Sort the list by extension key
+		ksort($localList);
+
 		return array(
 			'length' => count($localList),
 			'data' => array_values($localList)