By Sarah Young LONDON (Reuters) – British-based JD Sports will spend up to 3 billion pounds ($3.7 billion) to open as many as 1,750 stores over the next five years, said new CEO Régis Schultz, outlining his plans for the retailer to become an athletic leisurewear “powerhouse”. Schultz, a former boss of French retailer Monoprix, took over at FTSE-100 company JD in September following a tumultuous period that culminated in the ousting of long-standing executive chairman Peter Cowgill in May. His expansion plan sent shares in JD up 8% to 177 pence by midday trading on Thursday, their highest leve…