Update, merge zh-tw translations back to zh-hant and recover zh-cn, zh-sg translations in mediawiki/extensions/Babel
- Most of the zh-tw translations should be updated via zh-hant.
- Local (babel-*-n) translations should be kept.
- As zh-cn, zh-sg, zh-tw translations no longer being editable, update these translations in Gerrit.
Recovered translations from Change-Id I31cc6d967b0dd7dbec1d5de618134f3d5b85d176 and current zh-hans translations.