MediaWiki/languages/messages/MessagesDe_ch.php

<?php
/** Swiss High German (Schweizer Hochdeutsch)
 *
 * To improve a translation please visit https://translatewiki.net
 *
 * @ingroup Language
 * @file
 *
 */

$fallback = 'de';
$separatorTransformTable = [ ',' => "'", '.' => ',' ];