Fixes: https://github.com/go-gitea/gitea/issues/28371
Fixed by using a JS solution that formats according to `lang`, but alters the 24h format setting as per user's locale. This will work for all tooltips:
<img width="243" alt="Screenshot 2024-03-07 at 23 03 35" src="6d16c71c-6786-4eda-8cdc-50ec68ba62c6">
<img width="250" alt="Screenshot 2024-03-07 at 23 03 17" src="4e26bbb7-12df-4b81-bd37-14705e87e8f7">
<img width="310" alt="Screenshot 2024-03-07 at 23 14 34" src="1ef599f0-6401-4e19-b1da-59cdfc09b0f6">
I think there is only one other place in the UI where we render such absolute dates, which is in the actions view and which I've also fixed:
<img width="275" alt="Screenshot 2024-03-07 at 23 04 00" src="df0fbe1f-96ee-4338-ab5e-2b10e215005d">
(cherry picked from commit f86e9a03673b70d660a4b7a1e53748757d7a45fa)
427ab550a6