fix: leverage join misskey multilingual behaviour (#11908)

Co-authored-by: かっこかり <67428053+kakkokari-gtyih@users.noreply.github.com>

packages/frontend/src/components/MkVisitorDashboard.vue

@@ -114,8 +114,7 @@ function showMenu(ev) {
 }
 
 function exploreOtherServers() {
-	// TODO: 言語をよしなに
-	window.open('https://join.misskey.page/ja-JP/instances', '_blank');
+	window.open('https://join.misskey.page/instances', '_blank');
 }
 </script>