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/lauds-responsory-nativity-of-st-john-the-baptist.yml

@@ -4,18 +4,18 @@ id: lauds-responsory-nativity-of-st-john-the-baptist
 text:
   la: |
     R.br. Fuit homo * Missus a Deo.
-    ℟. Fuit homo * Missus a Deo.
-    ℣. Cui nomen erat Joánnes.
-    ℟. Missus a Deo.
-    ℣. Glória Patri, et Fílio, * et Spirítui Sancto.
-    ℟. Fuit homo * Missus a Deo.
+    R. Fuit homo * Missus a Deo.
+    V. Cui nomen erat Joánnes.
+    R. Missus a Deo.
+    V. Glória Patri, et Fílio, * et Spirítui Sancto.
+    R. Fuit homo * Missus a Deo.
   en: |
     R.br. There was a man sent from God.
-    ℟. There was a man sent from God.
-    ℣. Whose name was John.
-    ℟. Sent from God.
-    ℣. Glory be to the Father, and to the Son, * and to the Holy Ghost.
-    ℟. There was a man sent from God.
+    R. There was a man sent from God.
+    V. Whose name was John.
+    R. Sent from God.
+    V. Glory be to the Father, and to the Son, * and to the Holy Ghost.
+    R. There was a man sent from God.
 status:
   la: verified
   en: verified