Switching between en-us and another language

{
    "update_url": "https:\/\/clients2.google.com\/service\/update2\/crx",
    "name": "__MSG_name__",
    "version": "1.0.1",
    "manifest_version": 3,
    "description": "__MSG_description__",
    "default_locale": "en",
    "icons": {
        "16": "images\/icon16.png",
        "32": "images\/icon32.png",
        "48": "images\/icon48.png",
        "128": "images\/icon128.png"
    },
    "action": {
        "default_icon": {
            "16": "images\/icon16.png",
            "32": "images\/icon32.png",
            "48": "images\/icon48.png",
            "128": "images\/icon128.png"
        },
        "default_title": "__MSG_icon__"
    },
    "background": {
        "service_worker": "background.js"
    },
    "permissions": [
        "storage"
    ],
    "content_scripts": [
        {
            "matches": [
                "https:\/\/*.microsoft.com\/*"
            ],
            "js": [
                "content_script.js"
            ],
            "run_at": "document_end"
        }
    ],
    "options_page": "options.html"
}