Translation of challenger in German

Probably we will make additions to our dictionary. I'll be available in January and in February, but not in March, because I'll be in the United States for about three months. About a week in New York, a week in Chicago and Detroit.
It certainly is one of the reasons that a student from abroad is not as good in English as people who were born in America. This is an obstacle for all students and a challenge for the educational system.
Paris is a beautiful city and I wish you a lot of fun there. I love big cities. I am 40 years old and have a very beautiful and kind wife and a 20-year-old son. I work as a lawyer.