_content/tour: add translations

Add Tour of Go translations for French, German,
Korean, and Simplified Chinese.

Fixes golang/go#81336

Change-Id: I675dfdec39c20ae1ec874270834d9d2858face67
Reviewed-on: https://go-review.googlesource.com/c/website/+/829864
Reviewed-by: Dmitri Shuralyov <dmitshur@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
LUCI-TryBot-Result: golang-scoped@luci-project-accounts.iam.gserviceaccount.com <golang-scoped@luci-project-accounts.iam.gserviceaccount.com>
Auto-Submit: Madeline Kalil <mkalil@google.com>
diff --git a/_content/tour/welcome.article b/_content/tour/welcome.article
index 2c2c3d0..c82c781 100644
--- a/_content/tour/welcome.article
+++ b/_content/tour/welcome.article
@@ -50,9 +50,13 @@
 - [[https://go-tour-br.appspot.com/][Brazilian Portuguese — Português do Brasil]]
 - [[https://go-tour-ca.appspot.com/][Catalan — Català]]
 - [[https://go-tour-cz.appspot.com/][Czech — Česky]]
+- [[https://fr-go-dev.shuijingwanwq.com/tour][French — Français]]
+- [[https://de-go-dev.shuijingwanwq.com/tour][German — Deutsch]]
 - [[https://go-tour-id2.appspot.com/][Indonesian — Bahasa Indonesia]]
 - [[https://go-tour-jp.appspot.com/][Japanese — 日本語]]
+- [[https://ko-go-dev.shuijingwanwq.com/tour][Korean — 한국어]]
 - [[https://go-tour-pl1.appspot.com/][Polish — Polski]]
+- [[https://go-dev.shuijingwanwq.com/tour][Simplified Chinese — 简体中文]]
 - [[https://go-tour-lat.appspot.com/][Spanish — Español]]
 - [[https://go-tour-th.appspot.com/][Thai — ภาษาไทย]]
 - [[https://go-tour-ua-translation.lm.r.appspot.com/][Ukrainian — Українською]]