i18n(ja): Fix unnatural katakana and improve phrasing in Japanese translation

[shm11C3]

Description

This PR improves the Japanese translation by fixing unnatural katakana expressions and enhancing overall phrasing clarity.

Changes include:

• Replaced ウェッブ with the more common and natural ウェブ or Web
• Rephrased "ホット・リロード・ウェッブソケット" to "ホットリロード用の WebSocket"

These changes make the documentation easier to read and more aligned with common usage in technical Japanese.

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[J1-takai]

@shm11C3
Thank you for the corrections. Much appreciated. 👍
プログラムも GitHub もほとんど理解していない状態で、中国語チームの努力に触発されて、Google先生に頼りつつ Google 翻訳より読み易い日本語版を目指して順次対応中です。今後とも修正等よろしくお願いいたします。