When you localise at translatewiki.net, your messages will be used in all Wikimedia projects and eventually in all MediaWiki based projects. This is how we provide the standard support for your language. When messages change, at  translatewiki.net you will be prompted to revisit your translations. Localising is more efficient because we have innovated the process to make you more efficient; there is text explaining about messages and we have applied AJAX technology to reduce the number of clicks you have to make.