Thread:Support/Enable syncing of zh-tw and zh-hk for MediaWiki

Right now, zh-tw and zh-hk are disabled in favour of zh-hant on Translatewiki.net. This is done presumably because the two are largely identical, so it's better to concentrate the translators' effort in one place. However, there are occasionally differences in usage between the two, leading to minor issues in user interface. (Furthermore, since the languages are disabled here, there appears to be no way to update previous translations bundled with MediaWiki.) I think a nice middle ground would be to keep the languages disabled in Special:Translate, but enable syncing for messages translated by manually editing MediaWiki:Foo/zh-tw or MediaWiki:Foo/zh-hk (if technically doable). This would allow tweaks to be made, while preventing translators from unknowingly duplicating effort. (This also applies to interface messages for Wikimedia wikis, if that goes through a separate mechanism.)