Roles and permissions

In moodle 1.8.2 i notice that there is no moodledata/lang/xx_utf8_local just moodledata/lang/xx_utf8

After editing some help files and running cron.php i see no moodledata/lang/xx_utf8_local .

But in moodle 1.8.3 i notice moodledata/lang/xx_utf8_local

Is that correct 1.8.2 will not have moodledata/lang/xx_utf8_local ?

Can i upgrade 1.8.2 translation copying moodledata/lang/xx_utf8 from one server to another?

Thank´s in advance