Add a braille setting for Chinese word segmentation

[cary-rowen]

Link to issue number:

Fixes #20471

Summary of the issue:

Chinese word segmentation is always used with Chinese braille output tables.
Some users need to disable this behavior and let the selected braille table translate the original text directly.

Description of user facing changes:

A "Use Chinese word segmentation" checkbox has been added to the Braille settings category.

It is enabled by default to preserve the existing behavior and only affects Chinese braille output tables.
Context-sensitive help and User Guide documentation are included.

Description of developer facing changes:

There are no public API changes.

Description of development approach:

The change follows the conventions of existing Braille settings and preserves the current behavior by default.

Testing strategy:

Manual testing should cover the following:

• With a Chinese braille output table, confirm that word segmentation can be enabled and disabled.
• Confirm that changing the setting updates the braille output as expected.
• Confirm that the setting has no effect with non-Chinese braille output tables.
• Press F1 on the setting and confirm that the corresponding User Guide section opens.

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.

[cary-rowen]

HI cc @keyang556
Would you mind test this PR build?

[keyang556]

OK, I'll test it.

[keyang556]

Fixed, thank you.

[cary-rowen]

Thanks @keyang556

[keyang556]

I don't know, if possible, off by default in zhtw table(or nvda language), but on by default in zhcn table?

[Qchristensen]

User guide reads well

premature