Minor style fixes
Folder drop target
Improve display of unread count
Display nb of messages in account config
Fix frontend tests
Fix number of messages tooltips
Mass deletion of messages
Actions on multiple messages
Update some keyboard shortcuts
Bugfix on contact add
CSS fix on message drag end
Fix closing of all alerts
Allow to undo last action with Ctrl-Z
Merge remote-tracking branch 'brice/master' into refacto/no-promise
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