Verb conjugation of "curdle" in English

The billing of additional working hours is not justified, since it was our request to download the software and wait for the new version. They have admitted the error of the translation.
My correction were added and highlighted with yellow markers and attached to this email. Tell me now if you have any questions about grammar rules, since I was a teacher 10 years ago.
In winter it is a great place because you can ski. In the summer I like being in Paris because it is a very empty city in summer. The people head down to the coast, to Nice, Cannes and similar.