[TYPO3-mvc] FAL in own extension: localization of alternative text

[Gregor Hyneck]

Hi,

with the help of a article by Anja Leichsenring (http://buzz.typo3.org/teams/extbase/article/fal-and-extbase-the-easy-part/), I can use FAL in my own extension for images. 

I can access the alternative text for the original image by {image.originalResource.alternative} in Fluid. But how can I access the alternative text of the localized image in a second language? 
{image.alternative} does not work.
Properties of my image FileReference Object are  _localizedUid and _languageUid, but how can I access the alternative text directly?

thanks in advance
Gregor