If the UI is in English but characters are silent, you are missing the language_audio_en.pack . This file is much larger than the text file and is often excluded from smaller repacks.
If the game still doesn't display English, you may need to force it via the user script: total+war+attila+english+language+files+codex+exclusive
Check if local_en.pack exists. If you see local_ru.pack or local_fr.pack instead, the English data is missing. If the UI is in English but characters