An Argentine civil court upheld a 12-year sentence for former President Leopoldo F. Galtieri on charges of negligence and incompetence stemming from Argentina’s defeat in the 1982 Falklands War. The Federal Appeals Court in Buenos Aires also revised sentences handed down by a military tribunal in 1984 for two other members of the military junta that plunged Argentina into the war with Britain. Gen. Basilio Lami Dozo, former air force chief, had his sentence increased from eight to 12 years. The sentence of Adm. Jorge I. Anaya, former navy commander, was reduced from 14 years to 12. The court said all three officers, as equal members of the junta, bore equal responsibility.