public function afterSave()
 {
     LanguageTranslation::model()->deleteAll('id = ' . $this->id);
     if ($this->translations) {
         foreach ($this->translations as $language => $translation) {
             $language_translation = new LanguageTranslation();
             $language_translation->id = $this->id;
             $language_translation->translation = $translation;
             $language_translation->language = $language;
             $language_translation->save();
         }
     }
 }
<?php

if (!$this->model->isNewRecord) {
    $translations = LanguageTranslation::model()->findAll('id = ' . $this->model->id);
    $translations = ArrayHelper::extract($translations, 'language', 'translation');
}
$elements = array('message' => array('type' => 'textarea'));
$languages = Language::getList();
foreach ($languages as $id => $language) {
    if (Yii::app()->language == $id) {
        continue;
    }
    $value = null;
    if (isset($translations) && isset($translations[$id])) {
        $this->model->translations[$id] = $translations[$id];
    }
    $elements["translations[{$id}]"] = array('type' => 'textarea', 'label' => $language, 'value' => $value);
}
return array('activeForm' => array('id' => 'language-translation-form'), 'elements' => $elements, 'buttons' => array('submit' => array('type' => 'submit', 'value' => 'Сохранить')));