Improve language handling for MathCAT braille

[codeofdusk]

Link to issue number:

Split from #19227. Follow-up of #19368.

Summary of the issue:

• The automatic Braille entry for Finnish was incorrect.
• Several languages could have more reasonable Braille defaults.

Description of how this pull request fixes the issue:

Simplify (key on base language only, not region codes), fix "fi", and expand Braille auto language table.

Testing strategy:

Braille mapping still functional.

Known issues with pull request:

None known

Code Review Checklist:

• Documentation:
  • Change log entry
  • User Documentation
  • Developer / Technical Documentation
  • Context sensitive help for GUI changes
• Testing:
  • Unit tests
  • System (end to end) tests
  • Manual testing
• UX of all users considered:
  • Speech
  • Braille
  • Low Vision
  • Different web browsers
  • Localization in other languages / culture than English
• API is compatible with existing add-ons.
• Security precautions taken.

[Copilot]

Pull request overview

This pull request fixes the automatic Braille entry for Finnish and simplifies the MathCAT Braille language mapping by focusing on base language codes rather than region-specific codes. It also expands the Braille auto language table with additional language mappings.

• Corrected the Finnish Braille code from "ASCIIMath-finnish" to "ASCIIMath-fi"
• Simplified language mapping to use base language codes only (e.g., "pt" instead of "pt_BR", "pt_PT")
• Expanded the language-to-Braille code mapping table with 11 additional languages

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[seanbudd]

Thanks @codeofdusk