Remaining effort is clickable and switch to edit mode.
A input text is then displayed to allow user to edit the remaining effort.
When user hits enter, the new remaining effort is saved (new REST route).
When user hits escape, the remaining effort keeps the previous value and switch back to readonly mode.
If there is an error on save, an error modal is displayed asking to user to refresh the page.
Only users with enough rights can update the remaining effort.
We may need to add instructions to the user (enter/esc key) to help him edit the remaining effort (see example with add item in codepen: https://cdpn.io/enalean/debug/64e8b185e427659400a44ec1034cbe8b
). To be confirmed (how does it match the edit of avatar/title/... inormation ?).