If we have Tags for the language of the voices in the video, would that useful?
For example, if you are looking for a video with Japanese voice, you can use voice_acted and japanese_text to find it.
However, if there are no texts, you will not be able to find them.
In such cases it would be nice to have a tag like japanese_voice.
I know this is Not related TWYS-rule, but if we have, it'll help people to know what language is being used.
And possibly work together with translation_request.