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Originally posted by: Master Sifo-Dyas
Well, if "Return of the Jedi" would not have a certain duality in it's meaning, I would fully agree with you. Alas, I always deemed it very cool that you could actually interprete the film title in two ways: You could either say the Jedi as an institution/religion have returned, but you could also say that anakin - the jedi - returns.
In portuguese, the word "the" can be translated as "o", "a", "os" or "as", determining gender and number (singular/plural). The movie's title is "O retorno de Jedi", using "de" makes it somewhat ambiguous (like "return of jedi"), but it's more likely to mean "return of a singular Jedi". So yes, it could be Anakin's return...
For "Revenge of the Sith", the title was translated as "A vingança dos sith", which clearly means "revenge of the (many) sith". So it's not Palpatine's revenge, it's THEIR revenge.