Function booklibrs::actions::read::change_family

pub fn change_family(
    reader_base: &mut ReaderBase, 
    book_system: &mut BookSystem, 
    genres: &Genres, 
    caretaker: &mut Caretaker, 
    app: &App, 
    lang: Lang
)

Function that changes reader's second name. If you have mistakes in input, program will let you know