/**
 * Sets the currency depending on the language selected via WPML.
 *
 * Need help customising the code for your need? Hire us on Codeable: http://bit.ly/codeable_aelia
 *
 * @author Aelia
 * @link https://aelia.co
 */
function aelia_set_currency_by_language() {
  // If no languague was selected, don't do anything
  if(!defined('ICL_LANGUAGE_CODE')) {
    return;
  }

  // Map each language with the appropriate currency
  $currencies_by_language = array(
    'de' => 'EUR',
    'pt' => 'EUR',
    'sv' => 'SEK',
    // Etc etc
  );
  
  // Only change the currency on the frontend, depending on the language
  if((!is_admin() || defined('DOING_AJAX')) && isset($currencies_by_language[ICL_LANGUAGE_CODE])) {
    $_POST['aelia_cs_currency'] = $currencies_by_language[ICL_LANGUAGE_CODE];
  }
}
add_action('woocommerce_init', 'aelia_set_currency_by_language', 0);