Fix missing type definitions

[LitoMore]

The image data that I got from the client.getGridsById(gameId) returns the data in the format below:

{
  id: 484680,
  score: 0,
  style: 'alternate',
  width: 600,
  height: 900,
  nsfw: false,
  humor: false,
  notes: null,
  mime: 'image/png',
  language: 'en',
  url: 'https://cdn2.steamgriddb.com/grid/57bc9596033a61dba1c4df9a1c728d61.png',
  thumb: 'https://cdn2.steamgriddb.com/thumb/57bc9596033a61dba1c4df9a1c728d61.jpg',
  lock: false,
  epilepsy: false,
  upvotes: 0,
  downvotes: 0,
  author: {
    name: 'ABH20',
    steam64: '76561198058544946',
    avatar: 'https://avatars.steamstatic.com/378a48fc2172839e4ca7589e1d6bb235691714fa_medium.jpg'
  }
}

Do I need to update those tests for the new data structure?

And are tags and language still needed? Can I remove them from the type definition?