Play developer console "An unexpected error occurred. Please try again later." when adding translations

If you are facing this issue in july 2020 then the answer is that google has updated the play console and redirected on this url "https://play.google.com/console" If you have not redirected automatically to the above link then manually open this link.

Alright, I found very strange workaround that always submit from first try. So anyway open in Firebug Net tab and when pressing Publish you will see there a POST action is executed. Then it will just load and load and never finish. After about 2:58 minutes it gets aborted. So At this point right click on this POST request and click Resend so it starts resending and right at the same time click on the button Publish. Yes the button is not grayed out. So within a second it posts!