Change response in News widget

Content response in widget type News should provide following data:

• NewsContent
• createdBy -> username
• createdAt
• NewsCategory -> label
• titleImageUrl

AC

• the fields specified above are added to content attribute of widget QSMessage
• NewsContent and NewsCategory are nested within widget content (as with normal NewsItem response)
• Tests are running properly

Review

• the fields specified above are added to content attribute of widget QSMessage
  • NewsContent
  • createdBy -> username
  • createdAt
  • NewsCategory -> label
  • titleImageUrl
• NewsContent and NewsCategory are nested within widget content (as with normal NewsItem response)
• Tests are running properly