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-eleutherius-commemoration.yml

@@ -14,7 +14,7 @@ text:
     Orémus.
     Infirmitátem nostram réspice, omnípotens Deus: et, quia pondus própriæ actiónis gravat, beáti Eleuthérii Mártyris tui atque Pontíficis intercéssio gloriósa nos prótegat.
     Per Dóminum nostrum Jesum Christum, Fílium tuum: qui tecum vivit et regnat in unitáte Spíritus Sancti, Deus, per ómnia sǽcula sæculórum.
-    ℟. Amen.
+    R. Amen.
   en: |
     Ant. Daughters of Jerusalem, * come and see the crowned martyrs, the Lord crowned them in his solemnity and delight, alleluia, alleluia.
     V. The righteous shall flourish like the palm tree:
@@ -22,7 +22,7 @@ text:
     Let us pray.
     Mercifully consider our weakness, O Almighty God, and whereas by the burden of our sins we are sore, may the glorious intercession of blessed Eleutherius, Your Martyr and Bishop, sustain us.
     Through 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: draft
   en: draft