This task is spun out from T308649#8010691
Sometimes the service returns the following errors:
- "User <username> does not appear to have an account in English Wikipedia."
- "User <username> is a bot and therefore out of scope."
- "User <username> does not appear to have an account (or edits in scope) in English Wikipedia."
When this happens, display the message to the user.
Mockup (don't use the text from the mockup):