Add "Date Updated" to Sort By menu on Observations page

Platform(s): Web

URLs: https://www.inaturalist.org/observations

Description of need: For various reasons, I often sort observations by “Date Updated” to find the most recent or furthest from recently updated observations. However, to do this in the Observations page, rather than the Identify page, one needs to add &order_by=updated_at in the URL.

Feature request details: On the Identify page, one can simply go into Filters, under Sort By, and click Date Updated to have this feature activated. I ask for this dropdown option to be added to the Observations page.

Identify
Observations