Undefined constant 'LC_MESSAGES'

[martinperiphore]

I Got this error Undefined constant 'LC_MESSAGES'

  // array implies kirby >= 3.1.3 where can be array of LC_WHATEVER values.
  foreach ( [ LC_ALL, LC_CTYPE, LC_COLLATE, LC_MESSAGES ] as $w ) {
    $s = $lang->locale( $w );