- separate zh_hant to zh_hant_tw, zh_hant_hk and zh_hant_sg
- add new locales `zh-hant-sg`, `zh-hant-hk`, `zh-hant-tw`
- fix zh_hant and zh_hans typo and layout
- update `bots/browse/translations.js` `bots/console/translations.js`
`bots/mailman/translations.js` `bots/transactor/translations.js`