Add and fix Japanese translations in the {{AvailableInWorkers}} macro

[mfuji09]

Summary

Add and fix Japanese translations in the {{AvailableInWorkers}} macro

URL

https://developer.mozilla.org/ja/docs/Web/API/filereader/filereader
https://developer.mozilla.org/ja/docs/Web/API/DedicatedWorkerGlobalScope

Reproduction steps

1. Navigate those pages.

Expected behavior

The banners are shown as correct Japanese.

Actual behavior

• 注: is shown instead of メモ: which is used for **Note:**.
• Shown in English when the macro is used with any parameters.

Device

Desktop

Browser

Firefox

Browser version

Stable

Operating system

Windows

Screenshot

No response

Anything else?

No response

Validations

• I have read the Community Participation Guidelines.
• I have verified that there isn't already an issue that reports the same bug to avoid creating a duplicate.
• I have checked that this is a concrete bug. For Q&A open a GitHub Discussion.