Translated custom date/time labels in sub.php (#4803)

app/i18n/it/sub.php

@@ -99,8 +99,8 @@ return array(
 					'help' => 'Esempio: <code>descendant::img/@src</code>',
 				),
 				'item_timeFormat' => array(
-					'_' => 'Custom date/time format',	// TODO
-					'help' => 'Optional. A format supported by <a href="https://php.net/datetime.createfromformat" target="_blank"><code>DateTime::createFromFormat()</code></a> such as <code>d-m-Y H:i:s</code>',	// TODO
+					'_' => 'Formato personalizzato di data/ora',
+					'help' => 'Opzionale. Un formato supportato da <a href="https://php.net/datetime.createfromformat" target="_blank"><code>DateTime::createFromFormat()</code></a>, ad esempio <code>d-m-Y H:i:s</code>',
 				),
 				'item_timestamp' => array(
 					'_' => 'oggetto data',