l10n(w3c/templates/headers): updated Japanese translations (speced#3918)

Co-authored-by: Marcos Cáceres <marcos@marcosc.com>

src/w3c/templates/headers.js

@@ -67,17 +67,30 @@ const localizationStrings = {
     this_version: "本版本：",
   },
   ja: {
+    archives: "アーカイブ",
     author: "著者：",
     authors: "著者：",
+    commit_history: "更新履歴",
+    edited_in_place: "改版なく更新",
     editor: "編者：",
     editors: "編者：",
+    feedback: "フィードバック:",
     former_editor: "以前の版の編者：",
     former_editors: "以前の版の編者：",
+    history: "履歴:",
+    implementation_report: "実装レポート：",
     latest_editors_draft: "最新の編集用草案：",
     latest_published_version: "最新バージョン：",
-    this_version: "このバージョン：",
+    latest_recommendation: "最新の勧告版:",
+    message_topic: "… メール件名 …",
+    more_details_about_this_doc: "この文書についてのより詳細",
+    prev_editor_draft: "前回の編集用草案:",
+    prev_recommendation: "前回の勧告版:",
+    prev_version: "前回のバージョン:",
+    publication_history: "公表履歴",
     test_suite: "テストスイート：",
-    implementation_report: "実装レポート：",
+    this_version: "このバージョン：",
+    with_subject_line: "次の件名で",
   },
   nl: {
     author: "Auteur:",