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Save message was not visible enough for users to notice when the save had failed. This caused some loss of data in the past. (issue : #222 and #237)
This PR displays a "saving..." message for 2 seconds at least (so that users have time to see the message) and then a success or error message. This is copied from what google docs does.
Saving :

Done with success :

Done with error :

Errors are not fully displayed in the save message, because they are already displayed in the error bar at the top of the page (but that's debateable, we could display them)