They are repeats of the ones depicted, with the exception of symbols.php which appears once. The message isn't disappearing but is only appearing on 1 install, which has SPZ enabled. Also I count around 30 errors shown, not 54.
I used the Setup Wizard on one install and added some features which were unchecked. Perhaps it is related to those. Backup, HybridAuth, Failover etc. Not sure which is at fault if so.
(Click to enlarge)
#6096 - [beta6] Language errors on fresh install