Translations. Having a language game target for each level.

Hi everybody. I am having a problem to understand the process of localisation.
In the localisation dashboard I can have moren than one game target.
So I want to have one game target per Level of my game, to have it easier managing the textloads.
How, and where can I set the game target to be used in the current level ?
I once changed the name of my actual game target and it wasnt used anymore …
Anybody has experience with this ?
kind regards
stucki