Form adjustment, better selectpicker, #256

config/domain/registry/translations/messages.fr.yaml

migrations/Version20200408123444.php

src/Domain/Admin/Cloner/TreatmentCloner.php

src/Domain/Registry/Form/Type/ProofType.php

src/Domain/Registry/Form/Type/TreatmentType.php

src/Domain/Registry/Form/Type/ViolationType.php

src/Domain/Registry/Model/Treatment.php

src/Domain/Reporting/Generator/Csv/TreatmentGenerator.php

src/Domain/Reporting/Generator/Word/TreatmentGenerator.php

src/Infrastructure/ORM/Registry/Mapping/Treatment.orm.xml

templates/Registry/Treatment/_form.html.twig

templates/Registry/Treatment/show.html.twig

templates/base.html.twig

tests/Domain/Registry/Form/Type/TreatmentTypeTest.php

translations/messages.fr.yaml