How to make a transfer for woocommerce currency?

Question

WordPress

Hello. Made a substitution of the currency symbol "Ruble", the code is below. Is there any way to make a translation for it? To display "rub" in the English version?

add_filter('woocommerce_currency_symbol', 'custom_symbol_to_bukvi', 9999, 2);
 
function custom_symbol_to_bukvi( $valyuta_symbol, $valyuta_code ) {
  if( $valyuta_code === 'UAH' ) {
    return 'грн.';
  }
  if( $valyuta_code === 'RUB' ) {
    return 'руб.';
  }
  return $valyuta_symbol;
}