[ticket/15317] Fix phpbbcli language

Updated as Nicofuma said

PHPBB3-15317

phpBB/bin/phpbbcli.php

@@ -73,7 +73,7 @@
 
 /** @var \phpbb\language\language $language */
 $language = $phpbb_container->get('language');
-$language->set_default_language($config['default_lang']);
+$language->set_default_language($phpbb_container->get('config')['default_lang']);
 $language->add_lang(array('common', 'acp/common', 'cli'));
 
 /* @var $user \phpbb\user */