_content: change default title to Go programming language

Fixes golang/go#49812

Change-Id: Ie99ca5731794c1d3fb86bf4b90dc25c1b429465a
Reviewed-on: https://go-review.googlesource.com/c/website/+/367434
Trust: Zhuo Meng <mzh@golangcn.org>
Reviewed-by: Jamal Carvalho <jamal@golang.org>
Reviewed-by: Dmitri Shuralyov <dmitshur@google.com>
Trust: Dmitri Shuralyov <dmitshur@google.com>
diff --git a/_content/index.md b/_content/index.md
index 6736666..6fe45a5 100644
--- a/_content/index.md
+++ b/_content/index.md
@@ -1,5 +1,5 @@
 ---
-title: go.dev
+title: The Go Programming Language
 ---
 
 {{$canShare := not googleCN}}
diff --git a/_content/site.tmpl b/_content/site.tmpl
index 38bdf39..8c9db4c 100644
--- a/_content/site.tmpl
+++ b/_content/site.tmpl
@@ -28,7 +28,7 @@
   })(window,document,'script','dataLayer','GTM-W8MVQXG');</script>
   <!-- End Google Tag Manager -->
 <script src="/js/site.js"></script>
-<title>{{.title}}{{if ne .URL "/"}} - go.dev{{end}}</title>
+<title>{{.title}}{{if ne .URL "/"}} - The Go Programming Language{{end}}</title>
 {{if .link -}}
 <meta http-equiv="refresh" content="0; url={{.link}}">
 {{end -}}