At https://wikipedialibrary.wmflabs.org/applications/list/ there are two 'Filter by' dropdown menus. Both menus are currently empty and do not allow filtering.
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My guess would be that this is a result of the upgrade to django-autocomplete-light @Scardenasmolinar merged a few days ago (https://github.com/WikipediaLibrary/TWLight/pull/547).
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Hotfix pushed to master.
@Samwalton9 was right that the break happened with the DAL upgrade.
DAL cares about when jquery gets loaded, so the application list is one of the places where we load javascript it the top of the rendered html document. The issue was that it was included a second time at the bottom of the document, which is wrong, but tolerated in the old DAL version.
Dropping the second jquery include resolved the issue.