Modal should display in both create and edit modes:
- Permission on artifact field (REST + Angular)
- Open list fields (static, bound to users & groups) (REST + Angular)
- Search users in REST for autocompletion open list bound to users
- If possible, handle default values

For open list fields, angular-ui-select will be used.

+ fix when I pass a parent to the modal, if the parent.type == parent_selector_field.type, then hide the parent_selector_field, else display it so I can select an epic when I create a story in a sprint
+ fix parent list show only one pagination (only 10 parents, others are not loaded)
+ fix binded to user list : show user name according to current user preferences