ES6 export default highlighting failure

[sukima]

The following code block renders incorrectly on GitHub using the es6 highlighter.

export default {
  'user.edit.title': 'Edit User',
  'user.followers.title.one': 'One Follower',
  'user.followers.title.other': 'All {{count}} Followers',

  // nested objects work just like dotted keys
  'button': {
    'add_user': {
      'title': 'Add a user',
      'text': 'Add',
      'disabled': 'Saving...'
    }
  }
};

[winstliu]

/cc @MaximSokolov