Set the MathCAT output code automatically by NVDA language

[codeofdusk]

Link to issue number:

Closes #19233.

Summary of the issue:

nemeth is unsuitable as a default MathCAT output code for NVDA's global user base (see #19233 for details).

Description of how this pull request fixes the issue:

Adds a new "automatic" Braille code config option and switched to it by default. This option:

• Checks if there's a reasonable default code to use for the current NVDA language (es -> CMU, sv -> Swedish, vi -> Vietnamese);
• Otherwise, falls back to ASCIIMath.

Testing strategy:

Changed NVDA language to Spanish and verified that CMU became the effective code when the Braille code option was set to auto.

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 PR addresses the issue where "Nemeth" was an unsuitable default MathCAT Braille code for NVDA's global user base. It introduces an "Automatic" Braille code option that selects an appropriate code based on the current NVDA language, with ASCIIMath as the fallback.

Key changes:

• Adds automatic Braille code selection based on NVDA language (Spanish→CMU, Swedish→Swedish, Vietnamese→Vietnam, default→ASCIIMath)
• Changes the default MathCAT Braille code from "Nemeth" to "Auto"
• Updates the Math settings GUI to display the automatic option with the effective code shown in parentheses

Reviewed changes

Copilot reviewed 4 out of 4 changed files in this pull request and generated 3 comments.

Show a summary per file

File	Description
source/buildVersion.py	Bumps version from 2026.1 to 2026.2
user_docs/en/changes.md	Adds placeholder sections for the 2026.2 release
source/config/configSpec.py	Changes the default brailleCode from "Nemeth" to "Auto"
source/mathPres/MathCAT/preferences.py	Implements getAutoBrailleCode() for language-based code selection and setEffectiveBrailleCode() to apply the effective code at runtime
source/mathPres/MathCAT/MathCAT.py	Calls setEffectiveBrailleCode() during initialization to apply the effective Braille code
source/gui/settingsDialogs.py	Updates the Math settings panel to show "Automatic" as the first option with the current effective code displayed

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[codeofdusk]

CC @RyanMcCleary.

[seanbudd]

Thanks @codeofdusk - generally looks good to me

[seanbudd]

Thanks @codeofdusk