fix(citation): complete the modern tradition, and test the shipped file

Apocalypse -> Revelation was missing from [modern] while `revelation` was
already a declared tradition target, so the target existed with nothing
mapping onto it. Same Vulgate-to-modern shape as Ecclesiasticus -> Sirach.

The injectivity test used to hand-copy the mapping table, which asserted
things about the copy and nothing about the artifact: a mapping added to
traditions.ini and forgotten in the test would have passed. It now reads
lang/traditions.ini and additionally asserts that [vulgate] is empty --
an entry there would silently renumber the DEFAULT, the one thing this
design promises never happens -- and that no declared target is left
unreachable.

Mutation-proved three ways: declaring an unused target, deleting a
mapping, and adding an entry to [vulgate] each redden it, the first two
naming the offending book.

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