core: convert i18n data imports to import syntax

[bradenmacdonald]

This changes a few stray usages of Node's require() syntax to the modern ES6 module import syntax. It should have basically no effect, except that it makes the code more compatible with a wider range of tools. For example, building an MFE with Vite instead of Webpack requires this change.

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[codecov]

Codecov Report

All modified and coverable lines are covered by tests ✅

Project coverage is 83.41%. Comparing base (9d2e727) to head (e1d5f6e).

Additional details and impacted files

@@           Coverage Diff           @@
##           master     #700   +/-   ##
=======================================
  Coverage   83.41%   83.41%           
=======================================
  Files          40       40           
  Lines        1073     1073           
  Branches      197      197           
=======================================
  Hits          895      895           
  Misses        166      166           
  Partials       12       12           

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[adamstankiewicz]

LGTM; agreed it shouldn't really have any affect on consuming MFEs.

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