WOUNDED KNEE, S.D. — South Dakota’s Shannon County will now be Oglala Lakota County, removing the name of a man who Oglala Sioux Tribe activists say helped with negotiations that were a precursor for the breakup of tribal lands.The name change, which was official Friday, follows an April proclamation from the governor. More than 80 percent of the county’s voters approved the change in November.Officials in South Dakota and other states have for years moved to do away with overtly offensive names for …