chore: add i18n_extract to package.json for openedx-translations

[OmarIthawi]

This step is needed for openedx-translations repo to extract source files.

This contribution is part of the FC-0012 project which is sparked by the Translation Infrastructure update OEP-58.

This fixes the error below:

• https://github.com/openedx/openedx-translations/actions/runs/5721017099/job/15502202718

make extract_translations
....
npm run-script i18n_extract
npm ERR! Missing script: "i18n_extract"
make: *** [Makefile:48: i18n.extract] Error 1
Error: Process completed with exit code 2.

For all changes

• Ensure adequate tests are in place (or reviewed existing tests cover changes)

[codecov]

Codecov Report

Patch and project coverage have no change.

Comparison is base (88357d6) 83.18% compared to head (431e5d1) 83.18%.

Additional details and impacted files

@@           Coverage Diff           @@
##           master    #1013   +/-   ##
=======================================
  Coverage   83.18%   83.18%           
=======================================
  Files         397      397           
  Lines        8639     8639           
  Branches     1787     1787           
=======================================
  Hits         7186     7186           
  Misses       1415     1415           
  Partials       38       38           

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