Add tooltip to repo icons in explore page (#20241)

* Add label to repo icons in explore page

Co-authored-by: silverwind <me@silverwind.io>

templates/explore/repo_list.tmpl

@@ -32,9 +32,9 @@
 							{{end}}
 						{{end}}
 						{{if .IsFork}}
-							{{svg "octicon-repo-forked"}}
+							<span class="tooltip" data-content="{{$.locale.Tr "repo.fork"}}" data-position="bottom center">{{svg "octicon-repo-forked"}}</span>
 						{{else if .IsMirror}}
-							{{svg "octicon-mirror"}}
+							<span class="tooltip" data-content="{{$.locale.Tr "mirror"}}" data-position="bottom center">{{svg "octicon-mirror"}}</span>
 						{{end}}
 					</div>
 				</div>