To fix it:
in the partial app/frontend/modules/sfLucene/templates/_modelResult:
(You should also modify the partial _actionResult)
<?php $query = html_entity_decode($sf_data->getRaw('query'), ENT_NOQUOTES, sfConfig::get('sf_charset')) ?>
<?php echo link_to(highlight_keywords($result->getInternalTitle(ESC_RAW), $query, sfConfig::get('app_lucene_result_highlighter', '<strong class="highlight">%s</strong>')), add_highlight_qs($result->getInternalUri(), $query)) ?> (<?php echo $result->getScore() ?> %)
<p><?php echo highlight_result_text(__($result->getInternalDescription(ESC_RAW)), $query, sfConfig::get('app_lucene_result_size', 200), sfConfig::get('app_lucene_result_highlighter', '<strong class="highlight">%s</strong>')) ?></p>