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-bartholomew-collect.yml

@@ -6,12 +6,12 @@ text:
     Orémus.
     Omnípotens sempitérne Deus, qui hujus diéi venerándam sanctámque lætítiam in beáti Apóstoli tui Bartholomǽi festivitáte tribuísti: da Ecclésiæ tuæ, quǽsumus; et amáre quod crédidit, et prædicáre quod dócuit.
     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 Almighty and everlasting God, Who hast given unto us this day to be a day worshipful, and holy, and joyful, because of the Feast of thy blessed Apostle Bartholomew, grant, we beseech thee, unto thy Church both to love that which he believed, and to preach that which he taught.
     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