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-anthony-of-padua-collect.yml

@@ -7,12 +7,12 @@ text:
     Orémus.
     Ecclésiam tuam, Deus, beáti Antónii Confessóris tui solémnitas votíva lætíficet: ut spirituálibus semper muniátur auxíliis et gáudiis pérfrui mereátur ætérnis.
     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: |
     Let us pray.
     O God, make thy Church to be glad at the solemn memorial of thy blessed Confessor Anthony, causing her ever to be strong through thy ghostly succour, and fitting her to relish blessedness at thy right hand for evermore.
     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: verified
   en: verified