Make labels clickable in the comments section. (#21137)

This commit adds the possibility to click the labels in the message
"User added/removed the X label", which will lead to the issues page,
filtered by the clicked label.

This pull requests aims to fix #19768

_I've tried to follow the contribution guidelines as carefully as
possible, but in case I made a mistake: Please correct me._

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Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>
Co-authored-by: 6543 <6543@obermui.de>
Co-authored-by: techknowlogick <techknowlogick@gitea.io>

modules/templates/helper.go

@@ -376,15 +376,15 @@ func NewFuncMap() []template.FuncMap {
 			// the table is NOT sorted with this header
 			return ""
 		},
-		"RenderLabels": func(labels []*issues_model.Label) template.HTML {
+		"RenderLabels": func(labels []*issues_model.Label, repoLink string) template.HTML {
 			html := `<span class="labels-list">`
 			for _, label := range labels {
 				// Protect against nil value in labels - shouldn't happen but would cause a panic if so
 				if label == nil {
 					continue
 				}
-				html += fmt.Sprintf("<div class='ui label' style='color: %s; background-color: %s'>%s</div> ",
+				html += fmt.Sprintf("<a href='%s/issues?labels=%d' class='ui label' style='color: %s !important; background-color: %s !important'>%s</a> ",
-					label.ForegroundColor(), label.Color, RenderEmoji(label.Name))
+					repoLink, label.ID, label.ForegroundColor(), label.Color, RenderEmoji(label.Name))
 			}
 			html += "</span>"
 			return template.HTML(html)

templates/repo/issue/view_content/comments.tmpl

@@ -182,11 +182,11 @@
 					<span class="text grey">
 						{{template "shared/user/authorlink" .Poster}}
 						{{if and .AddedLabels (not .RemovedLabels)}}
-							{{$.locale.TrN (len .AddedLabels) "repo.issues.add_label" "repo.issues.add_labels" (RenderLabels .AddedLabels) $createdStr | Safe}}
+							{{$.locale.TrN (len .AddedLabels) "repo.issues.add_label" "repo.issues.add_labels" (RenderLabels .AddedLabels $.RepoLink) $createdStr | Safe}}
 						{{else if and (not .AddedLabels) .RemovedLabels}}
-							{{$.locale.TrN (len .RemovedLabels) "repo.issues.remove_label" "repo.issues.remove_labels" (RenderLabels .RemovedLabels) $createdStr | Safe}}
+							{{$.locale.TrN (len .RemovedLabels) "repo.issues.remove_label" "repo.issues.remove_labels" (RenderLabels .RemovedLabels $.RepoLink) $createdStr | Safe}}
 						{{else}}
-							{{$.locale.Tr "repo.issues.add_remove_labels" (RenderLabels .AddedLabels) (RenderLabels .RemovedLabels) $createdStr | Safe}}
+							{{$.locale.Tr "repo.issues.add_remove_labels" (RenderLabels .AddedLabels $.RepoLink) (RenderLabels .RemovedLabels $.RepoLink) $createdStr | Safe}}
 						{{end}}
 					</span>
 				</div>