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-clement-collect.yml

@@ -6,12 +6,12 @@ text:
     Orémus.
     Deus, qui nos ánnua beáti Cleméntis Mártyris tui atque Pontíficis solemnitáte lætíficas: concéde propítius; ut cujus natalítia cólimus, virtútem quoque passiónis imitémur.
     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 dost gladden us by the yearly Feast-day of thine holy Martyr, Clement mercifully grant unto us who keep their birthday, the strength to imitate their patience under suffering.
     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