Hello!When I entered the Yearly Othello tournament, I received a notification.But I did not understand what it means, since it cannot be translated.I entered the tournament for the second time.I hope I have no violation and I have not been banned, it seems that the rating is still being added.

You can re-enter arena tournaments without a violation - it may slow your pairing if you do it too frequently (to metagame who you might get to play).
Sorry about the translations, there are a number of places on the site where we could tighten up translations and will look to do that in the future.