By Graeme Murray Two important personality traits that make Princess Charlotte “very popular” in school have been disclosed by a royal expert. And they are said to be vital for any member of the Royal family wanting to please the public or liked by friends. Prince George, 10, Princess Charlotte, eight, and Prince Louis, five, have shown their developing personalities over the past year after attending engagements with their parents, Kate Middleton and Prince William. But Charlotte has grabbed the limelight due to her mature approach to life in the Firm. She has been praised for keeping her two…