Improvement?

Since all extensions translated here are in Git they should also be documented on MW.org. Thus it seems better to do something like "https://www.mediawiki.org/wiki/Extension:{{name}}" for the URL. Thus {{Desc|SomeExtension}} would be enough.

But then you would be forced to use CamelCase or whatever other weirdness the pagename has.

You are right, it should cater for alternaive names {{Desc|ExtensionName|AltExtensionName}}. Inserting links seems to be a bit boring. Still, just a suggestion.