Found the solution. Just a modification at the source code:
FILE: wp-content/plugins/moowoodle/classes/class-dc-woodle-enrollment.php
LINE: 186
ORIGINAL LINE: $user_data[‘lang’] = substr($b,0,2);
NEW LINE: $user_data[‘lang’] = ‘pt_br’; //OR ANY LANGUAGE YOU WANT. SAME LANGUAGE AS YOUR WP CONFIG.
Be sure to verify this modification when a new MooWoodle update became available 🙂
PS.: It may be possible to change the code to get 5 strings, so the copy of language should be the same. Something like substr($b,0,5); I didn’t tested it.
