ZURICH (Reuters) – Swatch Group SA is optimistic about growth prospects for this year after the world's biggest watchmaker reported a 26 percent rise in 2012 profit and hiked its dividend. The company, which makes colorful plastic watches and high-end timepieces, said healthy growth in January justified an optimistic outlook for 2013. "There is a realistic prospect of long-term growth in the Swiss watch industry of five to ten percent per year," the company said in a statement on Monday. …