Implement the dynamic update for language-specific filters

### Issue Details

There is no dynamic update of the list of available language-specific filters in the 4.0 app.

### Proposed solution

Add dynamic update of the list of available language-specific filters.

This list must be updated dynamically.

### Alternative solution

_No response_

The issue names no files, tests, or entry points. Start by locating the 4.0 app's language-specific filter list and how its available filters are currently populated; done means the list updates dynamically as supported filters change, matching the requested behavior shown in the issue.

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