feat(lang): Latin sanctoral names, and English

Sanctoral names are transcribed from the Missal's own calendarium and
kept in the GENITIVE, as the Missal prints them -- noted in the file so
nobody corrects them to the nominative.

English reuses the 327 names already in data/ef/sanctoral.sexp rather
than retyping them, and declares fallback = la, so an untranslated day in
an English booklet shows Latin rather than a slug. The test asserts the
FALLBACK works rather than that en.ini is exhaustive: that is what makes
a partial translation shippable from its first line.

Coverage now demands a name for every slug the engine can emit across
2020-2045, temporal and sanctoral alike.

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