chore: fix Cypress flaky tests by always setting English locale

[ghiscoding]

• we weren't resetting the locale to English when routing to a new example and in some cases running all Cypress tests locally could pollute the next Example test suite (ie, leaving previous example with French and routing to new example would show up in French when test assumes English)

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[codecov[bot]]

Codecov Report

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

Project coverage is 99.8%. Comparing base (2f86ec8) to head (56b97a7). Report is 3 commits behind head on master.

Additional details and impacted files

```diff @@ Coverage Diff @@ ## master #1730 +/- ## ====================================== Coverage 99.8% 99.8% ====================================== Files 187 187 Lines 30697 30697 Branches 9763 9763 ====================================== Hits 30608 30608 Misses 89 89 ```

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