Fix extension and update them.
I've installed Scribunto but haven't tested it yet. I've installed the Echo extension. And wikieditor works for me. Try clearing your cache before editing a page, as sometime wikieditor won't show up.
SimpleAntiSpam is already installed.
LocalizationUpdates is installed now.
You'll have to give me some time to finish upgrading the other extensions.
Thankyou could you uninstall simpleantispam due to it being discontinued and is now in the core of Mediawiki