Hi Andreas,
no there is no concept up to now. But i'm thinking of the SDK that comes in 1.2.
If I remember that correctly I heared it will be possible to access a table in BW via webservice and with that I guess you will be able to get these texts back in DesignStudio.
But i'm not a programmer who knows how to do it. Hopefully someone who build SDK components already can varify.
Another Idea: There was a blog from Murali Balreddy using CSS to internationalze Applications... see here: http://scn.sap.com/community/businessobjects-design-studio/blog/2013/07/04/how-to-internationalize-your-design-studio-application
Regards
Dirk