Add free translation input to segment view

[alex-rawlings-yyc]

Devin's review of this PR: https://app.devin.ai/review/sillsdev/interlinearizer-extension/pull/114

This change is 

Summary by CodeRabbit

Release Notes

• New Features
  • Added free-translation functionality allowing users to input and view free translations for each segment
  • Added "Show free translation" toggle in view options to display or hide free-translation input fields
  • Added project-level setting to control free-translation display across documents
  • Added localized placeholder text for free-translation and gloss input fields

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✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests
• Commit unit tests in branch gloss-segment

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