TranslationHelper::setTargetLanguage() 

\nn\t3::TranslationHelper()->setTargetLanguage($targetLanguage); 

Sets the target language for the translation

$translationHelper->setTargetLanguage( 'FR' );
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@param string $targetLanguage Target language of the translation
@return self

Source Code 

public function setTargetLanguage($targetLanguage) {
	$this->targetLanguage = $targetLanguage;
	return $this;
}
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