Add Pitjantjatjara language support to Quick Accent

[class-Avirup]

Closes #45025

[QuickAccent] Add Pitjantjatjara / Yankunytjatjara Language Support

Summary

This pull request adds support for Pitjantjatjara (Yankunytjatjara dialect)
to the Quick Accent feature. Pitjantjatjara is an Australian Aboriginal language
spoken in the Western and South Australian deserts.

What's New

• Users can now access Pitjantjatjara retroflex consonant characters (ḻ, ṉ, ṟ, ṯ)
  through Quick Accent
• Language is available in the Quick Accent settings dropdown menu
• Full localization support for UI display

Why This Matters

Pitjantjatjara uses unique retroflex consonants that are essential for:

• Correct pronunciation: Retroflex sounds are phonetically distinct from regular consonants
• Written accuracy: Proper character representation in educational materials
• Cultural preservation: Supporting Aboriginal language documentation and teaching
• Accessibility: Users without specialized keyboards can now type these characters easily

Character Mappings

The implementation adds 4 retroflex consonants:

• L → ḻ (Retroflex lateral approximant)
• N → ṉ (Retroflex nasal)
• R → ṟ (Retroflex approximant)
• T → ṯ (Retroflex stop)

Files Changed

1. Language.cs - Added PY enum value
2. CharacterMappings.cs - Added language entry with character mappings and display order
3. Resources.resw - Added localized UI string
4. expect.txt - Added language name to spell-check whitelist

Testing

• ✅ Language appears in Quick Accent settings dropdown
• ✅ Retroflex characters appear when holding L/N/R/T + activation key
• ✅ No build errors or warnings

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❌ forbidden-pattern	1
⚠️ large-file	1

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