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/holy-innocents-octave-commemoration.yml

@@ -29,7 +29,7 @@ text:
     Orémus.
     Deus, cujus hodiérna die præcónium Innocéntes Mártyres non loquéndo, sed moriéndo conféssi sunt: ómnia in nobis vitiórum mala mortífica; ut fidem tuam, quam lingua nostra lóquitur, étiam móribus vita fateátur.
     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: |
     Ant. Innocent babies were slain for Christ, sucklings were killed by a wicked king. Now they follow the Lamb without spot and cry without ceasing, Glory be to thee, O Lord.
     V. From beneath the throne of God all the saints cry out.
@@ -37,7 +37,7 @@ text:
     Let us pray.
     O God, whose praise the martyred Innocents on this day confessed, not by speaking, but by dying, destroy all the evils of sin in us, that our life also may proclaim in deeds, thy faith which our tongues profess.
     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