Use auto-updating, natively hoverable, localized time elements (#23988)

- Added [GitHub's `relative-time` element](https://github.com/github/relative-time-element)
- Converted all formatted timestamps to use this element
- No more flashes of unstyled content around time elements
- These elements are localized using the `lang` property of the HTML file
- Relative (e.g. the activities in the dashboard) and duration (e.g.
server uptime in the admin page) time elements are auto-updated to keep
up with the current time without refreshing the page
- Code that is not needed anymore such as `formatting.js` and parts of `since.go` have been deleted

Replaces #21440
Follows #22861

## Screenshots

### Localized

![image](https://user-images.githubusercontent.com/20454870/230775041-f0af4fda-8f6b-46d3-b8e3-d340c791a50c.png)

![image](https://user-images.githubusercontent.com/20454870/230673393-931415a9-5729-4ac3-9a89-c0fb5fbeeeb7.png)

### Tooltips

#### Native for dates

![image](https://user-images.githubusercontent.com/20454870/230797525-1fa0a854-83e3-484c-9da5-9425ab6528a3.png)

#### Interactive for relative

![image](https://user-images.githubusercontent.com/115237/230796860-51e1d640-c820-4a34-ba2e-39087020626a.png)

### Auto-update

![rec](https://user-images.githubusercontent.com/20454870/230672159-37480d8f-435a-43e9-a2b0-44073351c805.gif)

---------

Signed-off-by: Yarden Shoham <git@yardenshoham.com>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: delvh <dev.lh@web.de>

routers/web/admin/admin.go

@@ -18,8 +18,6 @@ import (
 	"code.gitea.io/gitea/modules/process"
 	"code.gitea.io/gitea/modules/queue"
 	"code.gitea.io/gitea/modules/setting"
-	"code.gitea.io/gitea/modules/timeutil"
-	"code.gitea.io/gitea/modules/translation"
 	"code.gitea.io/gitea/modules/updatechecker"
 	"code.gitea.io/gitea/modules/web"
 	"code.gitea.io/gitea/services/cron"
@@ -34,7 +32,7 @@ const (
 )
 
 var sysStatus struct {
-	Uptime       string
+	StartTime    string
 	NumGoroutine int
 
 	// General statistics.
@@ -75,7 +73,7 @@ var sysStatus struct {
 }
 
 func updateSystemStatus() {
-	sysStatus.Uptime = timeutil.TimeSincePro(setting.AppStartTime, translation.NewLocale("en-US"))
+	sysStatus.StartTime = setting.AppStartTime.Format(time.RFC3339)
 
 	m := new(runtime.MemStats)
 	runtime.ReadMemStats(m)