MissingResourceException when synchronizing a JTA transaction

In the class "com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionSynchronizationRegistryImple"

When we try to synchronize to an aborted JTA transaction a RollbackException is thrown. This exception is catched and we throw a RuntimeException using the key "com.arjuna.ats.internal.jta.transaction.arjunacore.syncrollbackmexception".
This key doesn't exist in the jta_msg_en_US.properties file. It seems to me that the end of the key should be syncrollbackexception because this key exist in the file.

I attached the corrected file.