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[bot]]

Codecov Report

All modified and coverable lines are covered by tests :white_check_mark:

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

Additional details and impacted files

```diff @@ 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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