Barbara, you might explore using "groups" and "groupings" It would require each of your 'groups' log in to your course using a specific "enrollment key" tied to their topic/language area. I'm not sure this applies to Topic blocks though... I know it would work for activities/resources.
I hope others answer your query too! [I use groups/groupings for a course where I want students to see just specific activities/resources related to a subject area (topic) but students can still see/read about each topic -- they just can't get to the activities other than for their particular group. Students log in to the course with a specific enrollment key which assigns them to a group. It works OK for my purposes, and actually promotes students wanting to do the other topics they read about. But, I am not trying to deal with multiple languages AND activities.]
Roles and permissions
Context dependent topics
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