This would be a nice list. Also similar: which languages are supported (and to what level: keyboard only, basic systems, other functions, most programs…).
I expect those mostly to appear near or after shipment and to update during following months.
I noticed in Zanata (translation platform) that phosh and chatty (the only ones I’ve found that relate to L5) have leaped several percent in finished translations (many localizations will never be made). Yay! 
A side note: this isn’t an issue at the moment and not for a while BUT Zanata is dying. 
The RedHat devs seem to be out since last fall. It’s still running though, for now, and I’ve noticed no issues. At some point an alternative tool is needed.