The language problem that Zidane constantly refers to is nothing more than an excuse; for some reason in Germany he does not have this language problem, although I have not heard that he is strong in German. Zidane wants to lead the dominant club/national team and is not particularly worried about sitting without a job, he is simply waiting for the option he needs to become available.
Zinedine Zidane if you ask me will take a coaching club in a team that's very dominant just like Manchester City despite the fact that it's also an English club. If he's not confident enough to try coaching with an average team in order to test his managerial abilities, then he should stick with been a pundit instead of trying to make unnecessary excuses
It is said that Zidane only wants to coach three clubs, Madrid, Marseille and the French national team. I think Zidane is also open to coaching other teams if he thinks he has good bargaining power. Currently, only Zidane is the luckiest coach who can win the Champions League trophy consecutively. We all miss him in action, he has been out for almost three seasons. United may never be able to sign him.