Hi John,
You posted that question to the Moodle plugins repository and I answered it yesterday as follows:
@John,
If you set your user language to Indonesian Bahasa, then you'll see that most (but not all) of the Questionnaire strings are available in that language. If you need all language strings to be available in Indonesian Bahasa, then you can translate them yourself on https://lang.moodle.org/
Notes.-
You need to register to log in to that translation site and use the filters to view the translated/un-translated strings.
Have you (or your admin) actually installed the Indonesian Bahasa language pack to your Moodle site? And have you tried to see which Questionnaire strings have not been translated?
If you are an admin you can view those files here: YOURMOODLESITE/moodledata\lang\id/questionnaire.php, as in this short extract:
$string['action'] = 'Aksi';
$string['activityoverview'] = 'Anda memiliki kuisioner yang kedaluwarsa';
$string['additionalinfo'] = 'Info Tambahan';
$string['additionalinfo_help'] = 'Teks yang akan ditampilkan di bagian atas halaman pertama kuesioner ini. (yaitu instruksi, info latar belakang, dll.)';
$string['addnewquestion'] = 'Menambahkan {$a} pertanyaan';
$string['addnewsection'] = 'Tambahkan bagian baru';
$string['addquestion'] = 'Tambahkan pertanyaan...';
$string['addquestions'] = 'Tambahkan pertanyaan';
$string['addquestiontosection'] = 'Tambahkan pertanyaan pada bagian';
$string['addselqtype'] = 'Tambahkan tipe pertanyaan';
$string['alignment'] = 'Perataan tombol radio';