After consulting with Admin Manaboy223, I've added language categories for the character and voice pages. For a long while, CeVIO products mainly supported Japanese vocals, with very little English releases, hence why there wasn't really a priority to add these categories. Since the franchise has expanded into three languages now (Japanese, English, and Mandarin Chinese) and more vocalists are becoming bilingual or are releasing solely on specific languages other than Japanese (like SELENA and Ying Can), now is a good time to start categorizing the languages.
There's two types of categories, which were modeled after Synthesizer V Wiki:
(Language) Vocalists: Used for character pages. Characters may have more than one depending if they support multiple languages (example: IA). They're sorted into release date order (example: Chis-A's would be Japanese, then English).
(Language) Voice: Used for voicebank pages. Some pages may have more than one language category if the page presents both. Otherwise, they'd be separated accordingly.
Hope you find these categories useful!