What to do with Enter Save Mode?

Question

Unity

Hello! This window popped up, what to press so that there is nothing to break?
And why did it come about? It didn’t get out before, although it’s possible that it could get out due to the fact that I didn’t add a line in the code and closed Unity.

Answer 1

Add the code in notepad and then open the project. And then, what prevented the message from being translated?