text: var prices = document.querySelectorAll('.box_actions_price_new, .a_katalog_cena, .katalog_cena, .katalog2_cena span, .product_price b');
  
  [].forEach.call(prices, function(price) {
    var oldPrice = parseInt(price.innerText.replace(/\s+/g, ''));
    var newPrice = parseInt(oldPrice * 1.15).toLocaleString();
    price.innerHTML = newPrice + ' Kč';
  });
  