UI Improvements (#1370)

* Improve event editor and event info dialog
* Fix the event_info_dialog crashing by adding url-textview.

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Co-authored-by: mil_mar <mil_mar>
Co-authored-by: brhiro <49073956+brhiro@users.noreply.github.com>
Change-Id: I6f21d4a254275dc9d7f11ec67ee96dd90d33ce37