Mikel Arteta has issued his Arsenal first-team squad a ‘very clear’ five-word message on what it will take for the Gunners to win their first Premier League title since 2004. It was once a fight between Arsenal and Manchester United to be crowned as the best team in England. Yet the north London giants now face a fight with the other Manchester club for Premier League supremacy. But Man City have had Arsenal’s number in the past two terms. Arsene Wenger led Arsenal to three Premier League titles through the first 12 editions after the division split from the EFL. But since the Invincibles secu…