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Not a translation convention - it's explained in-movie that the apes are actually speaking English, they just know it as the language they have always spoken.
Deleted line(s) 92 (click to see context) :
* ''Film/PlanetOfTheApes1968'' is a fantasy film in which the protagonist travels about 2000 years into the future and the Earth he discovers is populated with a species of humanoid Apes who speak modern English and a few humans who do not have the ability to understand or produce complex speech. The apes also use the normal modern Latin alphabet for writing.
