Glad to hear tat you are okay. 1st things 1st is that no one has been seriously injured or worse.
I am speculating as are most here that they will want to make a claim about this. It was an accident but you did fall through their window so it would hardly be fair that they take a hit on their insurance for it. As has been said, amusing the same happened to you at home you would want to claim of the other party and not off your own insurance. There normally is cover as part of your normal contents insurance I reckon so just let them sort it between themselves. I would call your insurance company to give them a heads up and ask what they need from you in the way of details of the accident etc.
Not sure how clipping the kerb becomes the responsibility of the restaurant so they could be counter sued. This view of “I tripped therefore I will sue” really hacks me off. Take responsibility and do not pass the blame.
I would expect that the new glass will be of a safer standard such as toughened. New fitting will be to the new standard but there will not be automatic upgrade/replacement of existing glass. K glass on all new double glazed units is an example.