Add pgettext labels to options in "Say all reads by"

[wmhn1872265132]

Link to issue number:

Follow-up to #20467

Summary of the issue:

#20467 added three options, but the "line" option has a completely different meaning in source\NVDAObjects\window\_msOfficeChart.py than it does here.

Description of user facing changes:

None

Description of developer facing changes:

None

Description of development approach:

Add pgettext labels to the options in "Say all reads by" to distinguish them from existing strings with the same text.

Testing strategy:

• Translation string check passed
• Tested that the translation of the "line" option is correct

Known issues with pull request:

None

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.