I18n fr javascript built-ins

[AugustinMauroy]

Description

translate javascript built-ins learn section

Check List

• [x] I have read the Contributing Guidelines and made commit messages that follow the guideline.
• [x] I have run npm run lint:js -- --fix and/or npm run lint:md -- --fix for my JavaScript and/or Markdown changes.
  • This is important as most of the cases your code changes might not be correctly linted
• [x] I have run npm run test to check if all tests are passing, and/or npm run test -- -u to update snapshots if I created and/or updated React Components.
• [x] I have checked that the build works locally and that npm run build work fine.
• [x] I've covered new added functionality with unit tests if necessary.