The nearly 100-year-old Journal Square is making a stunning return to its glory days, a transformation from a gritty commercial district to neck-straining luxury high-rises, A-list entertainment and trendy latte shops. “For decades there had been false promises of the renaissance of Journal Square, largely, that was because there was no concrete plan other than drawings,” Jersey City Mayor Steve Fulop said Friday. “There wasn’t a vision on how they were going to accomplish it.” For years city officials had hoped the One Journal Square project — a humongous twin tower proposed adjacent to the P…