The bulk update request #14830 has been approved by @evazion.
category chinese_audio -> meta
category english_audio -> meta
category french_audio -> meta
category japanese_audio -> meta
category korean_audio -> meta
category portuguese_audio -> meta
category russian_audio -> meta
category spanish_audio -> meta
category swedish_audio -> meta
Meta tags is reserved to contain non-visible information of a post, this includes audio-related ones like sound, audible music, volume warning and such.