feat: adding i18n support for modal dialog close button label

[jacobo-dominguez-wgu]

Description

#3529
Adding i18n support for the close button label on the modal dialog component
Recomendations on unit tests were ignored since those are not user facing texts.

release-23 pr

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 93.10%. Comparing base (58758d3) to head (21c57bb).
Report is 5 commits behind head on release-22.x.

Additional details and impacted files

@@              Coverage Diff              @@
##           release-22.x    #3624   +/-   ##
=============================================
  Coverage         93.09%   93.10%           
=============================================
  Files               251      252    +1     
  Lines              4592     4597    +5     
  Branches           1038     1038           
=============================================
+ Hits               4275     4280    +5     
  Misses              314      314           
  Partials              3        3           

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[brian-smith-tcril]

With MODAL_DIALOG_CLOSE_LABEL no longer being used I think it makes sense to remove it completely. I checked and it doesn't seem like it is being imported anywhere in the Open edX GH org https://github.com/search?q=org%3Aopenedx%20MODAL_DIALOG_CLOSE_LABEL&type=code

[jacobo-dominguez-wgu]

Done

[brian-smith-tcril]

Thanks for this!

[openedx-semantic-release-bot]

🎉 This PR is included in version 22.20.0 🎉

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[openedx-semantic-release-bot]

🎉 This PR is included in version 23.11.0 🎉

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• npm package (@latest dist-tag)
• GitHub release

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