That quickly!
Thank you chouby, the solution works properly.
function pll__get_translate($string,$language){
global $polylang;
$language = $polylang->model->get_language($language); // import_from_db expects a language object
$mo = new PLL_MO();
$mo->import_from_db($language); // import all translations in $language
// then you can translated any registered string with:
$translated_string = $mo->translate($string);
return $translated_string;
}
echo pll__get_translate('name','es'); //Nombre
echo pll__get_translate('name','en'); //Name
Thanks!!