UX: [permissiongroup] sticky form more compact, and with help text

src/Bundle/ChillMainBundle/Form/Type/ComposedRoleScopeType.php

@@ -88,6 +88,7 @@ class ComposedRoleScopeType extends AbstractType
             ])
             ->add('scope', EntityType::class, [
                 'class' => Scope::class,
+                'placeholder' => 'Choose amongst scopes',
                 'choice_label' => static function (Scope $scope) use ($translatableStringHelper) {
                     return $translatableStringHelper->localize($scope->getName());
                 },