TAIPEI, April 11 (Reuters) - Taiwan prosecutors on Friday for the first time charged a Chinese ship captain with intentionally damaging undersea cables off the island in February, after a rise in sea cable malfunctions alarmed Taiwan officials amid tensions with China. Prosecutors say the man was captain of the Chinese-crewed Hong Tai 58, registered in Togo, which Taiwanese authorities detained after suspecting the ship had dropped anchor near an undersea cable off southwestern Taiwan, damaging it.