CakePHP 1.3: adding 'id' column in sentences_translations

Fix for error:

Notice (8): Undefined index: id [CORE\cake\libs\model\model.php, line
1329]
Model::save() - CORE\cake\libs\model\model.php, line 1329
Model::__save() - CORE\cake\libs\model\model.php, line 1784
Model::saveAll() - CORE\cake\libs\model\model.php, line 1599
Link::add() - APP\models\link.php, line 132
Sentence::saveTranslation() - APP\models\sentence.php, line 1440
SentencesController::save_translation() -
APP\controllers\sentences_controller.php, line 451
Dispatcher::_invoke() - CORE\cake\dispatcher.php, line 204
Dispatcher::dispatch() - CORE\cake\dispatcher.php, line 171
[main] - APP\webroot\index.php, line 86

CakePHP expects the sentences_translations table to have an id.