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-francis-collect.yml

@@ -6,12 +6,12 @@ text:
     Orémus.
     Deus, qui Ecclésiam tuam beáti Francísci méritis fœtu novæ prolis amplíficas: tríbue nobis; ex ejus imitatióne, terréna despícere, et cæléstium donórum semper participatióne gaudére.
     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 didst use the worthy deeds of thy blessed servant Francis as a mean whereby to make thy Church again the mother of children, grant that we like him may set little price by earthly things, and attain unto a portion of those good things which Thou givest in heaven.
     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