In T225105: Clean up Translation handling we deprecated messages.json by using mail.json instead. When that change is done and deployed to production, we want to use messages.json instead of messages_laika.json.

Implementation details

1. Copy contents of messages_laika.json to messages.json in fundraising-frontend-content.
2. Add test that checks the contents of messages_laika.json against messages.json.
3. Change reference to messages.json in FunFunFactory
4. Deploy to test and production
5. Delete messages_laika.json