Show description as tooltip instead of title for labels (#28754) (#28766)

Backport #28754 by @delvh

Follow GitHubs behavior of showing the label description as a tooltip
instead of the browser native title.

## Before

![grafik](https://github.com/go-gitea/gitea/assets/51889757/70448327-467b-4bee-b799-40a442a5ce16)


## After

![grafik](https://github.com/go-gitea/gitea/assets/51889757/abe7d700-148b-4cef-a487-6b0f8f20b212)

Co-authored-by: delvh <dev.lh@web.de>

modules/templates/util_render.go

@@ -143,7 +143,7 @@ func RenderLabel(ctx context.Context, label *issues_model.Label) template.HTML {
 
 	if labelScope == "" {
 		// Regular label
-		s := fmt.Sprintf("<div class='ui label' style='color: %s !important; background-color: %s !important' title='%s'>%s</div>",
+		s := fmt.Sprintf("<div class='ui label' style='color: %s !important; background-color: %s !important' data-tooltip-content title='%s'>%s</div>",
 			textColor, label.Color, description, RenderEmoji(ctx, label.Name))
 		return template.HTML(s)
 	}
@@ -177,7 +177,7 @@ func RenderLabel(ctx context.Context, label *issues_model.Label) template.HTML {
 	itemColor := "#" + hex.EncodeToString(itemBytes)
 	scopeColor := "#" + hex.EncodeToString(scopeBytes)
 
-	s := fmt.Sprintf("<span class='ui label scope-parent' title='%s'>"+
+	s := fmt.Sprintf("<span class='ui label scope-parent' data-tooltip-content title='%s'>"+
 		"<div class='ui label scope-left' style='color: %s !important; background-color: %s !important'>%s</div>"+
 		"<div class='ui label scope-right' style='color: %s !important; background-color: %s !important'>%s</div>"+
 		"</span>",