I have a hard time keeping them straight. As I understand it

- Extension:ContentTranslation aids translation of _entire_ articles between _separate wikis_ . If you don't visit Special:ContentTranslation you don't notice its operation.

- Extension:Translate manages translation of article elements within a _single multilingual wiki_ with its Special:Translate page. It also presents available localizations of an article on that wiki with its <languages> tag. Within a <languages> tag it supports <tvar|id> and  to identify translatable elements (and confuse the average wiki editor :-) ;) ).

(But then how does Extension:Translate work on TranslateWiki to translate arbitrary messages strings of non-wiki projects?)

If I'm right, https://www.mediawiki.org/wiki/Extension%3ATranslate doesn't explain any of this. Can someone who knows Be Bold and update?

Thanks,

=S Page WMF Tech writer