Add August Matins readings for pre-1955 sanctoral saints

The Finding of St. Stephen, St. Donatus, St. Louis, St. Zephyrinus, and
Ss. Felix and Adauctus.

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

src/data/propers/nocturn-readings/st-donatus.yml

@@ -0,0 +1,29 @@
+# Matins Nocturn 2 reading for St. Donatus, Bishop and Martyr (Aug 7) —
+# pre-1955-but-post-1617. Plain Sancti/08-07.txt is a different, later
+# saint (St. Cajetan, canonized 1671) who displaced Donatus on the
+# general calendar's own Aug 7 slot; his content survives at the
+# suffixed sibling file (see memory vu-matins-pre1955-saints's "critical
+# wrinkle").
+# web/www/horas/Latin/Sancti/08-07o.txt, English/Sancti/08-07o.txt.
+# Single lesson (simplex-feast Lectio93), no responsory in the source.
+id: st-donatus
+readings:
+  - nocturn: 2
+    isGospel: false
+    text:
+      la: >-
+        Donatus, paréntibus propter Jesu Christi fidem interfectis, Arrétium in Etrúriam cum
+        Hilarino monacho ex fuga se cóntulit: cujus étiam urbis epíscopus creátus est. Ubi, cum a
+        Quadratiáno præfecto in Juliáni persecutióne uterque idola venerari juberétur, negántibus
+        illis se tam nefárium scelus commissuros, Hilarinus in óculis Quadratiáni tamdiu fustibus
+        cæsus est, dum efflaret ánimam; Donatus, veheménter et ipse cruciatus, gládio percússus est.
+        Quorum córpora a Christiánis prope eam urbem honorifice sepúlta sunt.
+      en: >-
+        Donatus was the child of a father and mother who had both been slain for Jesus Christ's
+        sake. He fled with the monk Hilarinus to Arezzo in Tuscany, of which city he afterwards
+        became Bishop. There the Prefect Quadratian, during the persecution under Julian, commanded
+        both Hilarinus and Donatus to worship idols, and when they both refused to commit such
+        abominable iniquity, Hilarinus was beaten with clubs before the eyes of Quadratian, until he
+        gave up the ghost. Donatus also was savagely tortured, and slain with the sword. The
+        Christians buried their bodies honourably hard by the city.
+    status: { la: verified, en: verified }