Update Japanese translations for KeyboardShortcuts. (#5858)

app/javascript/mastodon/locales/ja.json

@@ -102,23 +102,23 @@
   "home.column_settings.show_reblogs": "ブースト表示",
   "home.column_settings.show_replies": "返信表示",
   "home.settings": "カラム設定",
-  "keyboard_shortcuts.back": "to navigate back",
-  "keyboard_shortcuts.boost": "to boost",
-  "keyboard_shortcuts.column": "to focus a status in one of the columns",
-  "keyboard_shortcuts.compose": "to focus the compose textarea",
-  "keyboard_shortcuts.description": "Description",
-  "keyboard_shortcuts.down": "to move down in the list",
-  "keyboard_shortcuts.enter": "to open status",
-  "keyboard_shortcuts.favourite": "to favourite",
-  "keyboard_shortcuts.heading": "Keyboard Shortcuts",
-  "keyboard_shortcuts.hotkey": "Hotkey",
-  "keyboard_shortcuts.legend": "to display this legend",
-  "keyboard_shortcuts.mention": "to mention author",
-  "keyboard_shortcuts.reply": "to reply",
-  "keyboard_shortcuts.search": "to focus search",
-  "keyboard_shortcuts.toot": "to start a brand new toot",
-  "keyboard_shortcuts.unfocus": "to un-focus compose textarea/search",
-  "keyboard_shortcuts.up": "to move up in the list",
+  "keyboard_shortcuts.back": "戻る",
+  "keyboard_shortcuts.boost": "ブースト",
+  "keyboard_shortcuts.column": "左からn番目のカラム内最新トゥートに移動",
+  "keyboard_shortcuts.compose": "トゥート入力欄に移動",
+  "keyboard_shortcuts.description": "説明",
+  "keyboard_shortcuts.down": "カラム内一つ下に移動",
+  "keyboard_shortcuts.enter": "トゥートの詳細を表示",
+  "keyboard_shortcuts.favourite": "お気に入り",
+  "keyboard_shortcuts.heading": "キーボードショートカット一覧",
+  "keyboard_shortcuts.hotkey": "ホットキー",
+  "keyboard_shortcuts.legend": "この一覧を表示",
+  "keyboard_shortcuts.mention": "メンション",
+  "keyboard_shortcuts.reply": "返信",
+  "keyboard_shortcuts.search": "検索欄に移動",
+  "keyboard_shortcuts.toot": "新規トゥート",
+  "keyboard_shortcuts.unfocus": "トゥート入力欄・検索欄から離れる",
+  "keyboard_shortcuts.up": "カラム内一つ上に移動",
   "lightbox.close": "閉じる",
   "lightbox.next": "次",
   "lightbox.previous": "前",