internal/middleware: delete Language and languageTag

The Language middleware isn't referenced anywhere else in the code, so
the context tag can't be set anywhere and languageTag must always be
returning English. Just hardcode English everywhere instead

For golang/go#61399

Change-Id: Id8cee6b9fb87a7f8f3460fb6eaf2f14ea0af7c8d
Reviewed-on: https://go-review.googlesource.com/c/pkgsite/+/514675
Run-TryBot: Michael Matloob <[email protected]>
TryBot-Result: Gopher Robot <[email protected]>
kokoro-CI: kokoro <[email protected]>
Reviewed-by: Jamal Carvalho <[email protected]>

internal/frontend/imports.go

@@ -10,8 +10,8 @@ import (
 
 	"golang.org/x/pkgsite/internal"
 	"golang.org/x/pkgsite/internal/log"
-	"golang.org/x/pkgsite/internal/middleware"
 	"golang.org/x/pkgsite/internal/stdlib"
+	"golang.org/x/text/language"
 	"golang.org/x/text/message"
 )
 
@@ -125,7 +125,7 @@ func fetchImportedByDetails(ctx context.Context, ds internal.DataSource, pkgPath
 	// Display the number of importers, taking into account the number we
 	// actually retrieved, the limit on that number, and the imported-by count
 	// in the search_documents table.
-	pr := message.NewPrinter(middleware.LanguageTag(ctx))
+	pr := message.NewPrinter(language.English)
 	var (
 		display string
 		pkgword = "package"

internal/frontend/main.go

@@ -16,9 +16,9 @@ import (
 	"golang.org/x/pkgsite/internal/godoc"
 	"golang.org/x/pkgsite/internal/godoc/dochtml"
 	"golang.org/x/pkgsite/internal/log"
-	"golang.org/x/pkgsite/internal/middleware"
 	"golang.org/x/pkgsite/internal/middleware/stats"
 	"golang.org/x/pkgsite/internal/version"
+	"golang.org/x/text/language"
 	"golang.org/x/text/message"
 )
 
@@ -196,7 +196,7 @@ func fetchMainDetails(ctx context.Context, ds internal.DataSource, um *internal.
 	}
 	isTaggedVersion := versionType != version.TypePseudo
 	isStableVersion := semver.Major(um.Version) != "v0" && versionType == version.TypeRelease
-	pr := message.NewPrinter(middleware.LanguageTag(ctx))
+	pr := message.NewPrinter(language.English)
 	return &MainDetails{
 		ExpandReadme:      expandReadme,
 		Directories:       unitDirectories(append(subdirectories, nestedModules...)),

internal/frontend/search.go

@@ -22,10 +22,10 @@ import (
 	"golang.org/x/pkgsite/internal"
 	"golang.org/x/pkgsite/internal/derrors"
 	"golang.org/x/pkgsite/internal/log"
-	"golang.org/x/pkgsite/internal/middleware"
 	"golang.org/x/pkgsite/internal/stdlib"
 	"golang.org/x/pkgsite/internal/version"
 	"golang.org/x/pkgsite/internal/vuln"
+	"golang.org/x/text/language"
 	"golang.org/x/text/message"
 )
 
@@ -254,7 +254,7 @@ func fetchSearchPage(ctx context.Context, ds internal.DataSource, cq, symbol str
 
 	var results []*SearchResult
 	for _, r := range dbresults {
-		sr := newSearchResult(r, searchSymbols, message.NewPrinter(middleware.LanguageTag(ctx)))
+		sr := newSearchResult(r, searchSymbols, message.NewPrinter(language.English))
 		results = append(results, sr)
 	}