improve styles + Merge branch 'fmaster' of github.com:aenario/cozy-agenda

Conflicts:
	client/app/views/styles/application.styl
use datetimepicker instead of HTML5
prevent memory leak
missing translations
Merge branch 'master' of github.com:frankrousseau/cozy-agenda

Conflicts:
	client/app/views/styles/application.styl
	client/app/views/templates/popover_content.jade
Merge github.com:aenario/cozy-agenda
debug popover button
fix styles
fix reccurence display