Convert::toLanguageId() 

\nn\t3::Convert()->toLanguageId($languageCode = NULL); 

Konvertiert ein zweistelliges Sprachkürzel (z.B. 'de', 'en') in die Sprach-ID (z.B. '0', '1')

// Sprach-ID 0 -> 'de'
\nn\t3::Convert('de')->toLanguageId();
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@param int $sysLanguageUid
@return string

Source Code 

public function toLanguageId($languageCode = null)
{
	if (is_numeric($languageCode)) {
		return $languageCode;
	}
	$key = $languageCode !== null ? $languageCode : $this->initialArgument;
	$languages = \nn\t3::Environment()->getLanguages('iso-639-1', 'languageId');
	return $languages[$key] ?? '';
}
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