Not for the first time, needless JavaScript "enhancements" have damaged Wiktionary by breaking standard operating-system UI behaviour. (This is particularly painful for those with disabilities and special accessibility requirements, heavy keyboard use, etc.) PLEASE don't mess with standard UI elements like this.

To reproduce the bug:

1. On English Wiktionary, as an admin, choose to delete a page.
2. Focus the text box labelled "Other/additional reason" (by clicking or tabbing).
3. Press Enter.

Expected behaviour: I am in a form's text box, so Enter should submit the form.

Actual behaviour: the "Reason" dropdown list drops down. (Truly bizarre: I have never before seen a UI where you could drop down a list using the keyboard when the list wasn't even focused!)