We need to add a linter to the i18n package, we are mainly
interested by the jest linting rules so we create
a jest eslint config pluggable our other configs and to the
i18n eslint config.
We install Jest to test our i18n package.
We tests:
- the extraction of the translations on the Desk app fo crowdin
- the formatings of the translations from crowdin to the app
- we check that all the translations are present in the app
We connect the tests to the CI.