Drupal Commerce Localisation - translate the currency symbol

<?php
/**
 * Implementation of hook_commerce_currency_info_alter().
 */
function MyModule_commerce_currency_info_alter(&$currencies, $langcode) {
  // Add a curreny format callback so we can take over formating.
  $currencies['RUB']['format_callback'] = 'MyModule_commerce_currency_format';
}


/**
 * Currency format callback
 */
function MyModule_commerce_currency_format($amount, $currency, $object = NULL) {
  // Get the language.
  global $language;
  $lang_name = $language->language ;
  if ($lang_name != 'ru') {
    // If not Russian we will use the international code for the symbol.
    return MyModule_original_commerce_currency_format($amount, $currency['code'], 'RUB', $object, FALSE);
  }
  else {
    // If is Russian we will use the Russian code for the symbol.
    return MyModule_original_commerce_currency_format($amount, $currency['code'], 'руб', $object, FALSE);
  }
}

/**
 * Copy of commerce_currency_format from commerce.module
 *
 * The only changes are:
 * 1) The removal of the format_callback line (commented out).
 * 2) Option to set the $symbol instead of $currency['symbol'].
 */
function MyModule_original_commerce_currency_format($amount, $currency_code, $symbol, $object = NULL, $convert = TRUE) {
  // First load the currency array.
  $currency = commerce_currency_load($currency_code);

  // Then convert the price amount to the currency's major unit decimal value.
  if ($convert == TRUE) {
    $amount = commerce_currency_amount_to_decimal($amount, $currency_code);
  }

  // Remove the custom format callback so we dont go into an endless loop.
  // if (!empty($currency['format_callback'])) {
  //   return $currency['format_callback']($amount, $currency, $object);
  // }

  // Format the price as a number.
  $price = number_format(commerce_currency_round(abs($amount), $currency), $currency['decimals'], $currency['decimal_separator'], $currency['thousands_separator']);

  // Establish the replacement values to format this price for its currency.
  $replacements = array(
    '@code_before' => $currency['code_placement'] == 'before' ? $currency['code'] : '',
    '@symbol_before' => $currency['symbol_placement'] == 'before' ? $symbol : '',
    '@price' => $price,
    '@symbol_after' => $currency['symbol_placement'] == 'after' ? $symbol : '',
    '@code_after' => $currency['code_placement'] == 'after' ? $currency['code'] : '',
    '@negative' => $amount < 0 ? '-' : '',
    '@symbol_spacer' => $currency['symbol_spacer'],
    '@code_spacer' => $currency['code_spacer'],
  );

  return trim(t('@code_before@code_spacer@negative@symbol_before@price@symbol_spacer@symbol_after@code_spacer@code_after', $replacements));
}
?>