WordPress Deepl Locale -> Lang Map

code.php

<?php

if( !function_exists( 'wp_get_available_translations') )
  require_once ABSPATH . 'wp-admin/includes/translation-install.php';

$deepl = [
  "BG", "CS", "DA", "DE", "EL", "ES", "ET", "FI", "FR", "HU",
  "IT", "JA", "LT", "LV", "NL", "PL", "RO", "RU", "SK", "SL", "SV", "ZH",
  "EN-GB", "EN-US",
  "PT-PT", "PT-BR"
];

$available_translations = wp_get_available_translations();

$data = [];

foreach( $available_translations as $available_translation_key => $available_translation ) {
  $l = str_replace( '_', '-', strtoupper( $available_translation[ 'language' ] ) );

  if( in_array( $l, $deepl ) ) {
    $data[ $available_translation[ 'language' ] ] = $l;

    continue;
  }

  if( strpos( $l, '-' ) === false )
    continue;

  $l = substr( $l, 0, strpos( $l, '-' ) );

  if( in_array( $l, $deepl ) ) {
    $data[ $available_translation[ 'language' ] ] = $l;

    continue;
  }

  if( $l === 'EN' )
    $data[ $available_translation[ 'language' ] ] = 'EN-US';

  if( $l === 'PT' )
    $data[ $available_translation[ 'language' ] ] = 'PT-PT';
}

wpep_debug_dump( $data );

exit;