It's easy to implement if needed—not to refresh, but to simply remove it immediately. The current behavior, however, is by design—it shows the deleted translation as grayed out to indicate that it's on the way to disappear. I'm sure that @Pginer-WMF has a more detailed explanation for it.

IIRC, we didn't have that grayed background during the workshop. That may have been a trick due to the video projection.

Feel free to close that task :)

The design idea was to apply the "undo" pattern: as soon as the user clicks on "delete", without further confirmation, show the item as deleted (lighter) with the options to undo, or clear the item.

Since the "undo" behaviour was complex, the first iteration added a confirmation step.

If there are no plans to support the "undo" pattern in the short term (which I understand given it's not a common action and there are other design details to polish that happen more frequently: T127695), it may be better to have the item fade away (with a transition like T120067) after the user confirms the deletion.