Refactor locale number (#24134)

Before, the `GiteaLocaleNumber.js` was just written as a a drop-in
replacement for old `js-pretty-number`.

Actually, we can use Golang's `text` package to format.

This PR partially completes the TODOs in `GiteaLocaleNumber.js`:

> if we have complete backend locale support (eg: Golang "x/text"
package), we can drop this component.
> tooltip: only 2 usages of this, we can replace it with Golang's
"x/text/number" package in the future.

This PR also helps #24131

Screenshots:

<details>

![image](https://user-images.githubusercontent.com/2114189/232179420-b1b9974b-9d96-4408-b209-b80182c8b359.png)


![image](https://user-images.githubusercontent.com/2114189/232179416-14f36aa0-3f3e-4ac9-b366-7bd3a4464a11.png)

</details>

modules/templates/helper.go

@@ -132,7 +132,6 @@ func NewFuncMap() []template.FuncMap {
 		// -----------------------------------------------------------------
 		// time / number / format
 		"FileSize":      base.FileSize,
-		"LocaleNumber":  LocaleNumber,
 		"CountFmt":      base.FormatNumberSI,
 		"TimeSince":     timeutil.TimeSince,
 		"TimeSinceUnix": timeutil.TimeSinceUnix,
@@ -782,12 +781,6 @@ func mirrorRemoteAddress(ctx context.Context, m *repo_model.Repository, remoteNa
 	return a
 }
 
-// LocaleNumber renders a number with a Custom Element, browser will render it with a locale number
-func LocaleNumber(v interface{}) template.HTML {
-	num, _ := util.ToInt64(v)
-	return template.HTML(fmt.Sprintf(`<gitea-locale-number data-number="%d">%d</gitea-locale-number>`, num, num))
-}
-
 // Eval the expression and return the result, see the comment of eval.Expr for details.
 // To use this helper function in templates, pass each token as a separate parameter.
 //