Notice: Undefined index due to lack of language pack after update

1.2.20--1.3
after run admin/db_update.php
can't open index
display"Notice: Undefined index: lang_identifier in D:\gg\www\punbb\header.php on line 69

Notice: Undefined index: lang_identifier in D:\gg\www\punbb\header.php on line 69

Notice: Undefined index: Title separator in D:\gg\www\punbb\header.php on line 79

Notice: Undefined index: Forum index in D:\gg\www\punbb\header.php on line 105

Notice: Undefined index: Skip to content in D:\gg\www\punbb\header.php on line 164

Notice: Undefined index: Login nag in D:\gg\www\punbb\header.php on line 193

Notice: Undefined index: Active topics title in D:\gg\www\punbb\header.php on line 204

Notice: Undefined index: Active topics in D:\gg\www\punbb\header.php on line 204

Notice: Undefined index: Unanswered topics title in D:\gg\www\punbb\header.php on line 205

Notice: Undefined index: Unanswered topics in D:\gg\www\punbb\header.php on line 205

Notice: Undefined index: Forums in D:\gg\www\punbb\index.php on line 106
.....

EDIT: Altered the subject to be more searchable. //Anatoly