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/most-precious-blood-collect.yml

@@ -10,7 +10,7 @@ text:
     virtúte deféndi in terris; ut fructu perpétuo lætémur in cælis.
     Per eúndem Dóminum nostrum Jesum Christum, Fílium tuum: qui tecum vivit et regnat
     in unitáte Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
-    ℟. Amen.
+    R. Amen.
   en: |
     Let us pray.
     Almighty, eternal God, Who made thy only-begotten Son the Redeemer of the world,
@@ -20,7 +20,7 @@ text:
     fruit in heaven.
     Through the same Jesus Christ, thy Son our Lord, Who liveth and reigneth with thee,
     in the unity of the Holy Ghost, God, world without end.
-    ℟. Amen.
+    R. Amen.
 status:
   la: verified
   en: verified