typo

s/nonexiting/non-existing
Merge pull request #1945 from MadeleineHero/master

[FIX] typo
[IMP] web_tip: convert web_tip model to v8 api
[FIX] web_tip: grant write permission to users
[IMP] web_tip: add support for list views
[FIX] web_tip: consume can effectively use the api.multi decorator, to perform write in batch.
[IMP] website.snippet: convert media snippet into the new snippet api
[FIX] web: remove old datetimepicker and change by bootstrap datetimepicker
[FIX] web: update moment and datepicker library also add a controller to lazily load locale
[IMP]event:improvement kanban view with sparkline_bar,guage graph widget & with event detail link like sponsors,tracks,agenda
[FIX/ADD]while click on (agenda & public view) in event_kanban to redirect on website,Web_kanban:add new features (type = 'url')for kanban to redirect on website