Correct the exception message

Correct the exception message of class ServiceUnavailable

Change-Id: I8126a83df01199a5af32bd7742fcf0fa511bd598
Imported Translations from Transifex

Change-Id: I923ac8886d037c4d4318fc29b5a9ad8a3367b88f
Merge "Correct the exception message"
Merge "Imported Translations from Transifex"