cmd/frontend: remove i18n

Remove the Language middleware, effectively using English for all
i18n.

Revisit if/when we internationalize the whole site.

Change-Id: I0ad083cc057a33206c507856578983f44959cf69
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/347559
Trust: Jonathan Amsterdam <jba@google.com>
Run-TryBot: Jonathan Amsterdam <jba@google.com>
Reviewed-by: Julie Qiu <julie@golang.org>
diff --git a/cmd/frontend/main.go b/cmd/frontend/main.go
index f8100b4..e1e6e62 100644
--- a/cmd/frontend/main.go
+++ b/cmd/frontend/main.go
@@ -174,7 +174,6 @@
 		middleware.Panic(panicHandler),
 		ermw,
 		middleware.Timeout(54*time.Second),
-		middleware.Language,
 	)
 	addr := cfg.HostAddr(*hostAddr)
 	log.Infof(ctx, "Listening on addr %s", addr)