Reference

locale

Sets the global locale setting for PHP

Basic settings

return [
  'locale' => 'en_GB.utf-8'
];

Detailed settings

return [
  'locale' => [
    LC_COLLATE  => 'tr_TR.utf-8',
    LC_MONETARY => 'tr_TR.utf-8',
    LC_NUMERIC  => 'tr_TR.utf-8',
    LC_TIME     => 'tr_TR.utf-8',
    LC_MESSAGES => 'tr_TR.utf-8',
    LC_CTYPE    => 'en_US.utf-8'
  ]
];