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-thomas-aquinas-collect.yml

@@ -8,12 +8,12 @@ text:
     Orémus.
     Deus, qui Ecclésiam tuam beáti Thomæ Confessóris tui mira eruditióne claríficas, et sancta operatióne fœcúndas: da nobis, quǽsumus; et quæ dócuit, intelléctu conspícere, et quæ egit, imitatióne complére.
     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 enlighten thy Church by the wonderful learning of thy blessed Confessor Thomas, and quickenest her through his godly labours, grant unto thy people, we humbly beseech thee, ever to apprehend by their understanding what he teacheth, and in their life faithfully to practice the same.
     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