All language strings in included polls are shown in the default forum language, but not the users language.
libs\includepoll.inc.php:
require ("languages/{$config['LANGUAGE']}/includepoll.php");
fix:
require ("languages/{$user['USER_LANGUAGE']}/includepoll.php");
I think in ubbthreads.inc.php are a few more spots where $config['LANGUAGE'] needs to be changed to $user['USER_LANGUAGE'].
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