While refactoring the login form component I found many inconsistent
ways of importing the list of locales. So I decided to refactor the
imports altogether. Don't use `process.env` to import locales!
This will install the dependencies of the webapp/ folder first and then
overwrite the package.json to use different scripts. If we would track
dependencies in a separate package.json we would have to update it
with dependabot. We don't want that because of our precious build
server time.
