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The Problem

Web app manifests only support a single language. Here's what a Japanese user sees when installing an English-authored PWA:

QuickPay アプリのインストール

発行元: quickpay.example.com

✕

このサイトをよく使いますか？次のアプリをインストールします:

フォーカスしたウィンドウで開きます
タスクバーへのピン留めなどのクイックアクセスオプションがあります
複数のデバイス間で同期します

UI is in Japanese, but app name & icon are English!

The browser UI is in Japanese, but the app name and icon are stuck in English — because the manifest has no way to provide alternatives.

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Manifest Localization

New *_localized fields let developers provide per-language values. The browser picks the right one automatically.

// manifest.json
{
  "name": "QuickPay",
  "name_localized": {
    "ja": { "value": "クイックペイ", "lang": "ja" }
  },
  "icons": [{ "src": "icon-dollar.png" }],
  "icons_localized": {
    "ja": [{ "src": "icon-yen.png" }]
  }
}

❌ Before

QuickPay アプリのインストール

発行元: quickpay.example.com

✕

このサイトをよく使いますか？

✓ After

クイックペイアプリのインストール

発行元: quickpay.example.com

✕

このサイトをよく使いますか？

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Let's try it

This site has a localized manifest. Install it as a PWA and see localization in action!

How to try:

Set your browser language to Japanese (日本語)
edge://settings/languages
Click the install button in the address bar (upper-right) ↗
Notice the Japanese app name and icon in the install prompt
Or: install in English first, then switch to Japanese to see the change

The manifest at manifest.json includes name_localized and icons_localized with Japanese values.