refactor sentence

packages/app/resource/locales/en_US/translation.json

@@ -656,7 +656,7 @@
       "button_label": "Convert"
     },
     "toaster": {
-      "page_migration_succeeded": "Conversion of page to v5 has been successfully completed.",
+      "page_migration_succeeded": "Conversion of selected page to v5 has been successfully completed.",
       "page_migration_failed_with_paths": "Conversion of {{paths}} to v5 has been failed.",
       "page_migration_failed": "Conversion of page to v5 has been failed."
     },

packages/app/resource/locales/ja_JP/translation.json

@@ -655,7 +655,7 @@
       "button_label": "変換"
     },
     "toaster": {
-      "page_migration_succeeded": "ページの v5 互換形式への変換が正常に終了しました。",
+      "page_migration_succeeded": "選択されたページの v5 互換形式への変換が正常に終了しました。",
       "page_migration_failed_with_paths": "{{paths}} の v5 互換形式への変換中にエラーが発生しました。",
       "page_migration_failed": "ページの v5 互換形式への変換中にエラーが発生しました。"
     },

packages/app/resource/locales/zh_CN/translation.json

@@ -942,7 +942,7 @@
       "button_label": "转换"
     },
     "toaster": {
-      "page_migration_succeeded": "页面到 v5 兼容格式的转换已成功完成。",
+      "page_migration_succeeded": "已成功将所选页面转换为 v5 兼容格式。",
       "page_migration_failed_with_paths": "将 {{paths}} 转换为 v5 兼容格式时出错",
       "page_migration_failed": "将页面转换为 v5 兼容格式时出错。"
     },