See RobLa's proposal a while ago. We still have plenty of extensions and other pieces of MediaWiki whose interface and messages don't fit ("physically") for translation, we need something simple that devs can be really encouraged/forced to use.
Maybe this should be under testing component?
Version: unspecified
Severity: enhancement
URL: http://lists.wikimedia.org/pipermail/mediawiki-i18n/2010-September/thread.html
See Also:
https://bugzilla.wikimedia.org/show_bug.cgi?id=43547