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-frances-of-rome-collect.yml

@@ -8,12 +8,12 @@ text:
     Orémus.
     Deus, qui beátam Francíscam fámulam tuam, inter cétera grátiæ tuæ dona, familiári Angeli consuetúdine decorásti: concéde, quǽsumus; ut, intercessiónis ejus auxílio, Angelórum consórtium cónsequi mereámur.
     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 along with other gifts of thy grace honored blessed Frances, thy handmaid, with the close companionship of an angel, grant, we beseech thee, that by the help of her intercession we may be made worthy to attain the companionship of angels.
     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