Db::getColumnLabel() 

\nn\t3::Db()->getColumnLabel($column = '', $table = ''); 

Get localized label of a specific TCA field

@param string $column
@param string $table
@return string

Source Code 

public function getColumnLabel ( $column = '', $table = '' )
{
	$tca = $this->getColumns( $table );
	$label = $tca[$column]['label'] ?? '';
	if ($label && ($LL = LocalizationUtility::translate($label))) return $LL;
	return $label;
}
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