core/homeassistant/components/media_source/strings.json

{
  "exceptions": {
    "browse_media_failed": {
      "message": "Failed to browse media with content id {media_content_id}: {error}"
    },
    "resolve_media_failed": {
      "message": "Failed to resolve media with content id {media_content_id}: {error}"
    },
    "unknown_media_source": {
      "message": "Unknown media source: {domain}"
    }
  }
}