Then I also translated those strings in WPML -> Strings Translation. Now it is OK on the French version of your site. Please see the attached screenshots.
This specific problem with the Brooklyn theme has already been reported to us. The translations of the strings should work when added in WPML -> Strings Translation. However, the translation will not work on the front end unless the above XML code is added. The issue has been escalated to our compatibility team. We'll keep you updated here as soon as we have news about this problem.