By Rachel Hagan A joyous Christmas Eve dinner turned into horror when gunmen in Ireland opened fire on a popular restaurant. A man has died and a second man has been seriously injured following the attack in west Dublin on Sunday evening. The dead man, in his 20s, is believed to be one of the gunmen who went on a rampage at Browne’s Steakhouse just after 8pm as customers, including families with children, were dining out on Christmas Eve, RTE reports. The second man, in his 40s, is receiving treatment for gunshot wounds and is in a serious condition, gardaí (Irish police) said. The man who die…