[TYPO3-english] backend editors in multilanguage shows only language-restricted relation fields

[Domi]

Good morning,

I have an extbase extension which has a n:1 relation to another domain 
model: travel -> branch.

All branch entries are translated into multilangues. If an editor now 
creates a new travel in the selectbox of branch all languages are shown up.

How do I handle, that a user only can choose the branches of the correct 
language? Is there a maker in the TCA? Or what is the proper way?

Thanks for any answers,

Dominic