i18n: Add Japanese translations for privacy policy and more (#7049)

* Update Japanese translations.

* Update Japanese translations.

* Update Japanese translations.

* Update Japanese translations.

* Add Japanese translations for #6984, #7040, #7072.
Update Japanese translations for privacy policy.

* Add Japanese translations for #7032, #7074, #7089.

* Proofreading Japanese translations for privacy policy.

app/javascript/mastodon/locales/defaultMessages.json

@@ -114,6 +114,15 @@
     ],
     "path": "app/javascript/mastodon/components/domain.json"
   },
+  {
+    "descriptors": [
+      {
+        "defaultMessage": "Load more",
+        "id": "status.load_more"
+      }
+    ],
+    "path": "app/javascript/mastodon/components/load_gap.json"
+  },
   {
     "descriptors": [
       {

app/javascript/mastodon/locales/ja.json

@@ -240,6 +240,7 @@
   "status.block": "@{name}さんをブロック",
   "status.cannot_reblog": "この投稿はブーストできません",
   "status.delete": "削除",
+  "status.direct": "@{name}さんにダイレクトメッセージ",
   "status.embed": "埋め込み",
   "status.favourite": "お気に入り",
   "status.load_more": "もっと見る",
@@ -269,6 +270,7 @@
   "tabs_bar.home": "ホーム",
   "tabs_bar.local_timeline": "ローカル",
   "tabs_bar.notifications": "通知",
+  "tabs_bar.search": "検索",
   "ui.beforeunload": "Mastodonから離れると送信前の投稿は失われます。",
   "upload_area.title": "ドラッグ＆ドロップでアップロード",
   "upload_button.label": "メディアを追加",