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/ss-symphorosa-and-seven-sons-collect.yml

@@ -7,12 +7,12 @@ text:
     Orémus.
     Deus, qui nos concédis sanctórum Mártyrum tuórum Symphorósæ et filiórum ejus natalítia cólere: da nobis in ætérna beatitúdine de eórum societáte 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 dost permit us to keep the birthday of thy holy Martyrs Symphorosa and her sons, grant that we may enjoy their fellowship in everlasting happiness.
     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