BERLIN (Reuters) - German sportswear company Adidas said it expects a significant acceleration of sales in the fourth quarter after it reported stronger-than-expected sales and operating profit for the third quarter as it returned to growth in Europe.Sales rose a currency-adjusted 6% to 6.41 billion euros ($7.10 billion), beating average analyst forecasts for 6.32 billion euros, while operating profit was flat at 897 million euros, also above analyst consensus for 882 million euros.Shares in..