propers: Benedictus antiphons for September's sanctoral entries (5/5)

4 authored fresh (Matthew, Ss. Cyprian and Justina, Ss. Cosmas and
Damian, Jerome), 1 corrected (the Nativity of the BVM -- confirmed
sourced from the Roman rite's raw [Ant 1] rather than a real Monastic
1617 rendering, same pattern as every month so far).

Matthew needed the same register fix as Matthias/Barnabas/James the
Greater/Bartholomew (Matt 19:27ff, same verse): the source's own
English existed but read jarringly modern next to everything else,
reworded to match and marked draft.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>

src/data/propers/common/nativity-bvm-antiphon.yml

@@ -1,12 +1,14 @@
-# Verified against Divinum Officium (Latin/English Sancti/09-08.txt's own
-# [Ant 1] — the Lauds-hour antiphon, not Terce's. That file's own
-# "(rubrica cisterciensis)" alternate is a different text entirely; the
-# plain default is used here for consistency with every other saint file
-# in this set.
+# Verified against Divinum Officium (Monastic Tridentinum 1617), Lauds
+# live query, the Nativity of the Blessed Virgin Mary's own day
+# (2026-09-08) -- the Benedictus antiphon. Corrects the previous version
+# of this file, which had been sourced from the Roman/secular rite's
+# Sancti/09-08.txt's own [Ant 1] instead: real but different text from
+# what Monastic 1617 actually renders at Lauds, same mistake as
+# St. Lawrence's earlier fix.
 id: nativity-bvm-antiphon
 text:
-  la: "Gloriósæ * Vírginis Maríæ ortum digníssimum recolámus, quæ et Genitrícis dignitátem obtínuit, et virginálem pudicítiam non amísit."
-  en: "Let us tell again * of the right worthy Birth of the glorious Virgin Mary, who gained the honour of Motherhood without losing the guilelessness of a Maid."
+  la: "Nativitátem hodiérnam perpétuæ Vírginis Genitrícis Dei Maríæ solémniter celebrémus, qua celsitúdo throni procéssit, allelúja."
+  en: "Let us this day keep solemnly the Birthday of Mary, Mother but still Maiden, her Birth, a step toward the loftiness of her throne. Alleluia."
 status:
   la: verified
   en: verified