* make config into parameter
* test(new engine): local install test
* test(keys): fix test keys
* complete integration test for local install
* add simple mising mechanism
* add missing locales
* use t.Setenv instead of os.Setenv for tests
* locale: present y/n if localisation is not latin. Always accept y/n in every case
* question: use operation info for question
* edge case where localised n is equal to default y
* add tests for basic locales