Issue Summary

Saving a date in Date picker doesn't work with Enter/Return key. Cardback and front.

Platform: Trello web, desktop app

Steps to Reproduce

1. Open any board
2. Hover over a card or a checklist item inside a card
3. Press D or navigate to Date picker manually
4. Date/Change due date calendar opens
5. Pick any date from the calendar by clicking on it
6. Press Enter/Return key

Expected Results

The card or the checklist item gets assigned the date you've picked, the calendar closes.

Actual Results

The focus locks on the date in the calendar without saving it, the calendar doesn't close.

Workaround

Switching focus from Calendar to Start date, Due date, Set due date reminder sections or Save button with Tab key and pressing Enter/Return key works to Save the Date and close calendar.
Mouse click on a Save button also works.