[Form] added possibility to choose right answers for a ConfirmationQuestion

| Q             | A
| ------------- | ---
| Bug fix?      | no
| New feature?  | yes
| BC breaks?    | no
| Deprecations? | no
| Tests pass?   | yes
| Fixed tickets | 
| License       | MIT
| Doc PR        | 

With this pull request, the ConfirmationQuestion can accept one (or many) answer(s) like 'o', 'oui' (in french) or 'si' (in spanish) or anything else, it's up to you !
Default value is still 'y' (yes)