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-ubald-collect.yml

@@ -7,12 +7,12 @@ text:
     Orémus.
     Auxílium tuum nobis, Dómine, quǽsumus, placátus impénde: et, intercessióne beáti Ubáldi Confessóris tui atque Pontíficis, contra omnes diáboli nequítias déxteram super nos tuæ propitiatiónis exténde.
     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.
     Graciously help us, we beseech thee, O Lord, and at the petition of thy blessed Confessor and Bishop Ubald, stretch forth the right hand of thy mercy to shield us against all the fiery darts of the wicked one.
     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