How can I edit ARB file metadata like descriptions and placeholder definitions?

In ARB files, you can define metadata for each translation ID, including descriptions and placeholders:

{
    "welcomeMessage": "Welcome, {user}!",
    "@welcomeMessage": {
        "description": "A welcome message displayed to the user",
        "placeholders": {
            "user": {
                "type": "String",
                "description": "Name of the user",
                "example": "Alice"
            }
        }
    }
}

You can add or modify this metadata directly in BabelEdit using the icons located to the right of each translation entry:

BabelEdit reads metadata only from the source language ARB file. Before editing metadata, make sure to set the source language correctly via Toolbar → Languages → Source Language. Metadata from other language files is ignored.