fix(text-track-settings): localization not correctly applied

[amtins]

Description

Localization is not applied correctly in fieldset labels and select options. As a result, the text track setting modal dialog is only half translated.

Specific Changes proposed

• add localize at label level in TextTrackFieldset
• add localize at option level in TextTrackSelect
• add test cases

Requirements Checklist

• Feature implemented / Bug fixed
• If necessary, more likely in a feature request than a bug fix
  • Change has been verified in an actual browser (Chrome, Firefox, IE)
  • Unit Tests updated or fixed
  • Docs/guides updated
  • Example created (starter template on JSBin)
  • Has no DOM changes which impact accessiblilty or trigger warnings (e.g. Chrome issues tab)
  • Has no changes to JSDoc which cause npm run docs:api to error
• Reviewed by Two Core Contributors

[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.25%. Comparing base (d2b9d5c) to head (4768c18).
Report is 1 commits behind head on main.

Additional details and impacted files

@@            Coverage Diff             @@
##             main    #8904      +/-   ##
==========================================
- Coverage   83.85%   83.25%   -0.61%     
==========================================
  Files         120      120              
  Lines        8097     8097              
  Branches     1944     1944              
==========================================
- Hits         6790     6741      -49     
- Misses       1307     1356      +49     

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[mister-ben]

LGTM. And it reminds me, we really ought to show a placeholder cue when that dialog is open at least when there isn't one showing, otherwise the truncated dialog seems strange.