Voices redirect ref

[akiva10b]

This pull request adds new tests and refactors the redirect logic for the "voices" module to ensure that requests for valid references are properly redirected to the "library" module, while invalid references return a 404 error. The most significant changes are the introduction of a dedicated redirect function and new tests to cover these cases.

Redirect logic improvements:

• Added a new redirect_to_library function in reader/views.py to handle permanent redirects from the "voices" module to the "library" module, preserving query parameters and determining the correct target domain based on language.
• Updated the catchall redirect logic in reader/views.py to use redirect_to_library for valid references, and to return a 404 error for invalid references instead of redirecting.

Testing enhancements:

• Added test_voices_catchall_ref_redirects_to_library and test_voices_catchall_non_ref_404 in reader/tests/test_catchall_redirect.py to verify that valid references are redirected to the library module and invalid references return a 404 error, using test-specific domain settings.

[mergify]

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