TranslationHelper::getL18nPath() 

\nn\t3::TranslationHelper()->getL18nPath(); 

Return the absolute path to the l18n cache file. Default is typo3conf/l10n/nnhelpers/[LANG].autotranslated.json

$translationHelper->getL18nPath();
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| @return string

Source Code 

public function getL18nPath() {
	$path = rtrim($this->getL18nFolderpath(), '/').'/';
	$file = \nn\t3::File()->absPath( $path . strtolower($this->targetLanguage) . '.autotranslated.json' );
	return $file;
}
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