Add IMAP invalid login error message.
Add IMAP invalid login error message.

closeio/nylas,jobscore/sync-engine,ErinCall/sync-engine,ErinCall/sync-engine,Eagles2F/sync-engine,nylas/sync-engine,nylas/sync-engine,ErinCall/sync-engine,closeio/nylas,Eagles2F/sync-engine,jobscore/sync-engine,ErinCall/sync-engine,Eagles2F/sync-engine,Eagles2F/sync-engine,ErinCall/sync-engine,closeio/nylas,jobscore/sync-engine,jobscore/sync-engine,Eagles2F/sync-engine,closeio/nylas,nylas/sync-engine,nylas/sync-engine