Hey everyone !
You are doing an amazing work here. Up to date extensions on Mediawiki are priceless :)
I was wondering if you could bring back the $wgTwitterCardType in the template, at some point. It's perfect to have a fallback in the LocalSettings, but I would like to let my users choose the best twitter card for each page, as it depends of the content.
If the content is mostly text-related, the 'summary' setting is fine, but if it's a page with a much better and larger image to illustrate some content, it could be nice to display it with a 'summary with large image', for example.
Thank you again, and keep up the good work !