plugins/sys/data_handlers/pair_yes_no.php
<?php
return [
'0' => '<span class="btn btn-default btn-mini btn-xs btn-warning"><i class="icon-ban-circle fa fa-ban"></i> ' . t('No') . '</span>',
'1' => '<span class="btn btn-default btn-mini btn-xs btn-success"><i class="icon-ok fa fa-check"></i> ' . t('Yes') . '</span>',
];