Go to https://translatewiki.net/w/i.php?title=Special:Translate&filter=&group=core-0-mostused&uselang=en and click to select on any of the settings: All, Untranslated, Outdated, Translated, and Unreviewed.
The following Console error will be displayed:
Uncaught TypeError: Cannot read property 'changeSettings' of null at Object.changeFilter (<anonymous>:139:1821) at HTMLLIElement.<anonymous> (<anonymous>:145:258) at HTMLLIElement.dispatch (VM2974 load.php:69) at HTMLLIElement.elemData.handle (VM2974 load.php:66)