MODEL PRUEBA.PHP:
 class Prueba extends AppModel
{

	var $name = 'Prueba';
	
	var $validate = array
	(
		'title' => array
		(
			'required' => array('rule' => array('minLength', 1),			'message'	=> 'Required')
		),
		'content' => array
		(
			'required' => array('rule' => array('minLength', 1),			'message'	=> 'Required')
		),
	);

	//var $actsAs = array ();
	var $actsAs = array('Translate' => array('title', 'content'));


CONTROLLER ADMIN_ADD:
	function admin_add($lang = null)
	{
		// Layout on this view
		$this->layout    = 'admin';
		
		// If form is submitted
		if (!empty($this->data))
		{
			$this->Prueba->create();
			$languages = array('spa', 'eng', 'por', 'gal', 'ped');
			foreach($languages as $v)
			{
				$this->Prueba->locale=$v;
				$data = array('title' => 'titulerrimo', 'content' => 'Contenterrimo');
				$this->Prueba->save($data);
			}
		}
	}


	function admin_add($lang = null)
	{
		// Layout on this view
		$this->layout    = 'admin';
		
		// If form is submitted
		if (!empty($this->data))
		{
			$this->Prueba->create();
			$languages = array('spa', 'eng', 'por', 'gal', 'ped');
			foreach($languages as $v)
			{
				$this->Prueba->locale=$v;
				$data = array('title' => 'titulerrimo', 'content' => 'Contenterrimo');
				$this->Prueba->save($data);
			}
		}
	}

VISTA (aunque da igual, el $data lo genero en controlador):
				<?php echo $form->create('Prueba')."\n";?>
					<fieldset>
						<legend><?php echo sprintf(__('Add %s', true), __('Prueba', true));?></legend>
					<?php
						# Spa
						echo $form->input('Pruebaspa.title');
						echo $form->input('Pruebaspa.content');
						# Eng
						echo $form->input('Pruebaeng.title');
						echo $form->input('Pruebaeng.content');
						# Por
						echo $form->input('Pruebapor.title');
						echo $form->input('Pruebapor.content');
						# Gal
						echo $form->input('Pruebagal.title');
						echo $form->input('Pruebagal.content');
					?>
					</fieldset>
				<?php echo $form->end('Submit')."\n";?>


SQL DEBUG:
1	DESCRIBE `pruebas`		4	4	1
2	DESCRIBE `i18n`		6	6	1
3	INSERT INTO `pruebas` (`modified`,`created`) VALUES ('2008-02-11 17:11:53','2008-02-11 17:11:53')		1		1
4	SELECT LAST_INSERT_ID() AS insertID		1	1	0
5	INSERT INTO `i18n` (`locale`,`model`,`foreign_key`,`field`,`content`) VALUES ('spa','Prueba',6,'title','titulerrimo')		1		0
6	SELECT LAST_INSERT_ID() AS insertID		1	1	0
7	INSERT INTO `i18n` (`locale`,`model`,`foreign_key`,`field`,`content`) VALUES ('spa','Prueba',6,'content','Contenterrimo')		1		0
8	SELECT LAST_INSERT_ID() AS insertID		1	1	0
9	SELECT COUNT(DISTINCT(`Prueba`.`id`)) AS count FROM `pruebas` AS `Prueba` INNER JOIN `i18n` AS `I18nModel` ON (`Prueba`.`id` = `I18nModel`.`foreign_key` AND `I18nModel`.`model` = 'Prueba' AND `I18nModel`.`locale` = 'eng') WHERE `Prueba`.`id` = 6 		1	1	1
10	INSERT INTO `pruebas` (`modified`,`created`) VALUES ('2008-02-11 17:11:53','2008-02-11 17:11:53')		1		0
11	SELECT LAST_INSERT_ID() AS insertID		1	1	0
12	INSERT INTO `i18n` (`locale`,`model`,`foreign_key`,`field`,`content`) VALUES ('eng','Prueba',7,'title','titulerrimo')		1		0
13	SELECT LAST_INSERT_ID() AS insertID		1	1	0
14	INSERT INTO `i18n` (`locale`,`model`,`foreign_key`,`field`,`content`) VALUES ('eng','Prueba',7,'content','Contenterrimo')		1		0
15	SELECT LAST_INSERT_ID() AS insertID		1	1	0
16	SELECT COUNT(DISTINCT(`Prueba`.`id`)) AS count FROM `pruebas` AS `Prueba` INNER JOIN `i18n` AS `I18nModel` ON (`Prueba`.`id` = `I18nModel`.`foreign_key` AND `I18nModel`.`model` = 'Prueba' AND `I18nModel`.`locale` = 'por') WHERE `Prueba`.`id` = 7 		1	1	1
17	INSERT INTO `pruebas` (`modified`,`created`) VALUES ('2008-02-11 17:11:53','2008-02-11 17:11:53')		1		0
18	SELECT LAST_INSERT_ID() AS insertID		1	1	0
19	INSERT INTO `i18n` (`locale`,`model`,`foreign_key`,`field`,`content`) VALUES ('por','Prueba',8,'title','titulerrimo')		1		0
20	SELECT LAST_INSERT_ID() AS insertID		1	1	0
21	INSERT INTO `i18n` (`locale`,`model`,`foreign_key`,`field`,`content`) VALUES ('por','Prueba',8,'content','Contenterrimo')		1		0
22	SELECT LAST_INSERT_ID() AS insertID		1	1	0
23	SELECT COUNT(DISTINCT(`Prueba`.`id`)) AS count FROM `pruebas` AS `Prueba` INNER JOIN `i18n` AS `I18nModel` ON (`Prueba`.`id` = `I18nModel`.`foreign_key` AND `I18nModel`.`model` = 'Prueba' AND `I18nModel`.`locale` = 'gal') WHERE `Prueba`.`id` = 8 		1	1	1
24	INSERT INTO `pruebas` (`modified`,`created`) VALUES ('2008-02-11 17:11:53','2008-02-11 17:11:53')		1		0
25	SELECT LAST_INSERT_ID() AS insertID		1	1	0
26	INSERT INTO `i18n` (`locale`,`model`,`foreign_key`,`field`,`content`) VALUES ('gal','Prueba',9,'title','titulerrimo')		1		0
27	SELECT LAST_INSERT_ID() AS insertID		1	1	0
28	INSERT INTO `i18n` (`locale`,`model`,`foreign_key`,`field`,`content`) VALUES ('gal','Prueba',9,'content','Contenterrimo')		1		0
29	SELECT LAST_INSERT_ID() AS insertID		1	1	0
30	SELECT COUNT(DISTINCT(`Prueba`.`id`)) AS count FROM `pruebas` AS `Prueba` INNER JOIN `i18n` AS `I18nModel` ON (`Prueba`.`id` = `I18nModel`.`foreign_key` AND `I18nModel`.`model` = 'Prueba' AND `I18nModel`.`locale` = 'ped') WHERE `Prueba`.`id` = 9 		1	1	1
31	INSERT INTO `pruebas` (`modified`,`created`) VALUES ('2008-02-11 17:11:53','2008-02-11 17:11:53')		1		6
32	SELECT LAST_INSERT_ID() AS insertID		1	1	0
33	INSERT INTO `i18n` (`locale`,`model`,`foreign_key`,`field`,`content`) VALUES ('ped','Prueba',10,'title','titulerrimo')		1		0
34	SELECT LAST_INSERT_ID() AS insertID		1	1	0
35	INSERT INTO `i18n` (`locale`,`model`,`foreign_key`,`field`,`content`) VALUES ('ped','Prueba',10,'content','Contenterrimo')		1		0
36	SELECT LAST_INSERT_ID() AS insertID		1	1	0