Manual:$wgFixArabicUnicode

Details
Set this to true to replace Arabic presentation forms with their standard forms in the U+0600-U+06FF block. This only works if man-langcode>Special:MyLanguage/Manual:$wgLanguageCode|$wgLanguageCode is set to "ar".

Pages with titles containing presentation forms will become inaccessible, run man-maintscripts>Special:MyLanguage/Manual:Maintenance scripts|maintenance/cleanup>Special:MyLanguage/Manual:cleanupTitles.php|cleanupTitles.php to fix this.