About [[MediaWiki:Echo-desc/en]]

Thanks for your replies. His point is that the description doesn't actually describe anything, every extension is an "infrastracture" in some way and every extension is meant to enhance and supersede. Maybe it's impossible to describe what it actually does?

That's not accurate.

Echo is an infrastructure in the sense that its primary role is to build something that other extensions can build on. Most extensions, with a few exceptions (SemanticMediaWiki for example) are not primarily intended to be built on – they are the whole product.

It is also intended to supersede existing notifications and messaging techniques in a way that most extensions are not intended to supersede an existing piece of MediaWiki infrastructure.

You're welcome to change the English text, but I think you already know what Echo does, so I don't think this is an issue for translation.