This was 12 years ago. It's unneeded in 2022 so can be cleaned up.
See https://en.wikipedia.org/wiki/Modernista!#Controversies

There is if(/modernista\.com/.test(document.referrer)) { on

• https://am.wikipedia.org/wiki/MediaWiki:Common.js
• https://cu.wikipedia.org/wiki/MediaWiki:Common.js
• https://gan.wikipedia.org/wiki/MediaWiki:Common.js
• https://sc.wikipedia.org/wiki/MediaWiki:Common.js
• https://nl.wiktionary.org/wiki/MediaWiki:Common.js
• https://ta.wiktionary.org/wiki/MediaWiki:Common.js

(And this never ever made sense on Wiktionaries. Copy and paste sigh.)