Normalize versicle notation to plain V./R. across propers

Unicode ℣/℟ (U+2123/U+211F) were mixed unpredictably with plain V./R.
across ~550 proper YAML files, sometimes within the same file. Screen
readers can't announce the unicode glyphs. Replace all instances with
plain text.

Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01QC6jHsj75xcsTkapqJR6fD

src/data/propers/common/st-mary-magdalene-commemoration.yml

@@ -13,7 +13,7 @@ text:
     Orémus.
     Beátæ Maríæ Magdalénæ, quǽsumus, Dómine, suffrágiis adjuvémur: cujus précibus exorátus, quatriduánum fratrem Lázarum vivum ab ínferis resuscitásti:
     Qui vivis et regnas cum Deo Patre, in unitáte Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
-    ℟. Amen.
+    R. Amen.
   en: |
     Ant. Mary anointed the Feet of Jesus, and wiped Them with her hair; and the house was filled with the odour of the ointment.
     V. Grace is poured into thy lips.
@@ -21,7 +21,7 @@ text:
     Let us pray.
     O Lord, we pray thee, that we may be helped by the pleading of Blessed Mary Magdalen, whose prayers so much availed with thee, that Thou didst call up her brother Lazarus living from the dead, when he had lain in the grave four days already.
     Who livest and reignest with God the Father in the unity of the Holy Spirit, God, world without end.
-    ℟. Amen.
+    R. Amen.
 status:
   la: verified
   en: verified