[TYPO3-mvc] Month translation into German

[Rayuth You]

Hi list

By render month from controller to view (BE module), I got the months in 
English.
When I switch to German these month is still in English.
I want to translate these months when I switch language into German.

The month:
foreach (range(1,12) as $i) {
	$month[$i] = strftime('%B', mktime(0, 0, 0, $i));
}

Is it possible to do that? Or any hint?

Thanks,
Yuth