Add i18n for next/back/install buttons (#2045)

Co-authored-by: github-actions <github-actions@github.com>

src/locales/ja/main.json

@@ -65,6 +65,7 @@
   "g": {
     "about": "情報",
     "add": "追加",
+    "back": "戻る",
     "cancel": "キャンセル",
     "close": "閉じる",
     "color": "色",
@@ -91,12 +92,14 @@
     "icon": "アイコン",
     "imageFailedToLoad": "画像の読み込みに失敗しました",
     "insert": "挿入",
+    "install": "インストール",
     "keybinding": "キーバインディング",
     "loadAllFolders": "すべてのフォルダーを読み込む",
     "loadWorkflow": "ワークフローを読み込む",
     "loading": "読み込み中",
     "logs": "ログ",
     "newFolder": "新しいフォルダー",
+    "next": "次へ",
     "no": "いいえ",
     "noResultsFound": "結果が見つかりません",
     "noTasksFound": "タスクが見つかりません",