I didn't spend any time on this yesterday on account of needing to get
stuff done quickly. But, this makes it sane.
As a side note, I changed the list so it's one language per line and then did M-x sort-lines, so it's the same stuff, just sorted.
Cosmetic: Prettify the PROD_LANGUAGES list
LGTM, and Polish feedback works both with DEV/DEBUG = True and False.