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I think the reason that the aliens have accents in the PT is because the Galactic Republic was more politically cohesive than the Empire, because there was a tighter economic system that reqires a universal language for interplanetary trade, diplomacy, and communication. 35 years later, the EMpire is not capable of maintaining economic stability due to the Rebel Alliance and the Galactic civil war, so there has been a regress into a more localized cultural system in which all social activities are not on a galactic scale.
Or the Occam's razor explanation was to dumb down the film into racist stereotypes by using accents, and make it more marketable to children.