ROCKVILLE, Md. — The prosecutor in the case of a Liberian native charged with repeatedly raping and molesting a 7-year-old girl said Monday that he is filing an appeal of a controversial judge's ruling that dismissed all charges because an interpreter who spoke the suspect's rare West African dialect could not be found.Montgomery County State's Attorney John McCarthy called the ruling last Tuesday by Judge Katherine Savage "improper," adding that his office has "requested that an appeal be taken to reverse the court's order." Savage ruled on July 17 that Mahamu Kanneh, a Liberian who received asylum in the U.S....