class MenuTranslation

class MenuTranslation extends Menu {
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        $query = parent::query();
        $query->fields('i18n', [
            'lid',
            'textgroup',
            'context',
            'objectid',
            'type',
            'property',
            'objectindex',
            'format',
        ])
            ->fields('lt', [
            'lid',
            'translation',
            'language',
            'plid',
            'plural',
            'i18n_status',
        ])
            ->condition('i18n.textgroup', 'menu')
            ->isNotNull('lt.lid');
        $query->addField('m', 'language', 'm_language');
        $query->leftJoin('i18n_string', 'i18n', '[i18n].[objectid] = [m].[menu_name]');
        $query->leftJoin('locales_target', 'lt', '[lt].[lid] = [i18n].[lid]');
        return $query;
    }
    
    /**
     * {@inheritdoc}
     */
    public function fields() {
        $fields = [
            'lid' => $this->t('Language string ID'),
            'language' => $this->t('Menu language'),
            'textgroup' => $this->t('A module defined group of translations'),
            'context' => $this->t('Full string ID for quick search: type:objectid:property.'),
            'objectid' => $this->t('Object ID'),
            'type' => $this->t('Object type for this string'),
            'property' => $this->t('Object property for this string'),
            'objectindex' => $this->t('Integer value of Object ID'),
            'format' => $this->t('The {filter_format}.format of the string'),
            'translation' => $this->t('Translation'),
            'plid' => $this->t('Parent lid'),
            'i18n_status' => $this->t('Translation needs update'),
        ] + parent::fields();
        return $fields;
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        $ids = parent::getIds();
        $ids['language']['type'] = 'string';
        $ids['language']['alias'] = 'lt';
        $ids['property']['type'] = 'string';
        return $ids;
    }

}