You don't need to edit anything. Just run compile.php mysql en.
Disabling preg_replace for security reasons is ridiculous. Adminer's source codes...
Adminer 4.2.1 released
MySQL: Try to set utf8mb4 if possible
Corrections in French translation
Update German translation (thanks to kulmjens)
MySQL: Fix usage of utf8mb4 if the client libra...
Update French translation (thanks to vlakoff)