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-louis-commemoration.yml

@@ -14,7 +14,7 @@ text:
     Orémus.
     Deus, qui beátum Ludovícum Confessórem tuum de terréno regno ad cæléstis regni glóriam transtulísti: ejus, quǽsumus, méritis et intercessióne; Regis regum Jesu Christi, Fílii tui, fácias nos esse consórtes:
     Qui tecum vivit et regnat in unitáte Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
-    ℟. Amen.
+    R. Amen.
   en: |
     Ant. Well done, thou good and faithful servant; * thou hast been faithful over a few things, I will make thee ruler over many things; enter thou into the joy of thy Lord.
     V. The mouth of the righteous speaketh wisdom.
@@ -22,7 +22,7 @@ text:
     Let us pray.
     O God, Who didst give unto thy blessed Confessor Louis a glorious change from an earthly kingdom unto an heavenly, grant unto us, we beseech thee, for his sake and by his prayers, one day to enter like him into the Presence of the King of kings, even thy Son Jesus Christ.
     Who with thee liveth and reigneth, in the unity of the Holy Spirit, God, world without end.
-    ℟. Amen.
+    R. Amen.
 status:
   la: draft
   en: draft