Question ui dialogs

Issue #99 (closed)

FEATURE:

• ask for confirmation via dialogs before changing question status
• show information dialogs about the status change after action is complete

Status transitions where dialogs are added:

• Not submitted -> Submitted
• Submitted -> Rejected
• Submitted -> Under review
• Under review -> Published

Dialogs about editing/republishing a question are added in MR !74 (merged)

Additional feature:

• read rejected value with Question query and handle rejected state in Question component