Localize all the GroupBy*Date methods

Fixes #9745

resources/page/integration_test.go

@@ -0,0 +1,72 @@
+// Copyright 2021 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+package page_test
+
+import (
+	"testing"
+
+	"github.com/gohugoio/hugo/hugolib"
+)
+
+func TestGroupByLocalizedDate(t *testing.T) {
+
+	files := `
+-- config.toml --
+defaultContentLanguage = 'en'
+defaultContentLanguageInSubdir = true
+[languages]
+[languages.en]
+title = 'My blog'
+weight = 1
+[languages.fr]
+title = 'Mon blogue'
+weight = 2
+[languages.nn]
+title = 'Bloggen min'
+weight = 3
+-- content/p1.md --
+---
+title: "Post 1"
+date: "2020-01-01"
+---
+-- content/p2.md --
+---
+title: "Post 2"
+date: "2020-02-01"
+---
+-- content/p1.fr.md --
+---
+title: "Post 1"
+date: "2020-01-01"
+---
+-- content/p2.fr.md --
+---
+title: "Post 2"
+date: "2020-02-01"
+---
+-- layouts/index.html --
+{{ range $k, $v := site.RegularPages.GroupByDate "January, 2006" }}{{ $k }}|{{ $v.Key }}|{{ $v.Pages }}{{ end }}
+
+	`
+
+	b := hugolib.NewIntegrationTestBuilder(
+		hugolib.IntegrationTestConfig{
+			T:           t,
+			TxtarString: files,
+			NeedsOsFS:   true,
+		}).Build()
+
+	b.AssertFileContent("public/en/index.html", "0|February, 2020|Pages(1)1|January, 2020|Pages(1)")
+	b.AssertFileContent("public/fr/index.html", "0|février, 2020|Pages(1)1|janvier, 2020|Pages(1)")
+}