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/conversion-of-st-paul-collect.yml

@@ -8,12 +8,12 @@ text:
     Orémus.
     Deus, qui univérsum mundum beáti Pauli Apóstoli prædicatióne docuísti: da nobis, quǽsumus; ut, qui ejus hódie Conversiónem cólimus, per ejus ad te exémpla gradiámur.
     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, Who, through the teaching of the Blessed Apostle Paul, hast caused the light of the Gospel to shine throughout the world, grant, we beseech thee, that we, having his wonderful conversion as on this day in remembrance, may show forth our thankfulness unto thee for the same, by following the holy example which he hath set.
     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