Barnstormer,
You have mixed up Brazil and Chile. Brazil didn't operate the Canberra.
It wasn't the Chilean Canberras that had the spelling mistake on them but the RAF Hercules in country.
The Chief of the Chilean Air Force at the time of the conflict, General Fernando Matthei, revealed the following during a documentary.
"RAF C-130 with electronic intelligence equipment flew from the Pacific via Easter Island disgused as Chilean Air Force aircraft. This was done on the premise they had to fly between internal destinations within Chile collecting intelligence. The aircraft were noted by the misspelling of the Fuerza Area de Chile."
The Chilean documentary is available in Spanish on You Tube. Unfortunately not subtitled.
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YouTube - Chile y su participacion en Malvinas (1/6)
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YouTube - Chile y su participacion en Malvinas (2-6)
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YouTube - Chile y su participacion en Malvinas (3-6)
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YouTube - Chile y su participacion en Malvinas (4-6)
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YouTube - Chile y su participacion en Malvinas (5-6)
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YouTube - Chile y su participacion en Malvinas (6-6)
TJ