Merge pull request #208 from solispauwels/master

User managment GUI update
Merge pull request #209 from solispauwels/master

Messages GUI update
change date format
Merge pull request #210 from easy-es/agenda

change date format
change translation
Merge pull request #211 from easy-es/agenda

change translation
Fixture now creates valid email.
If a user can't open a resource, then the resource can't be seen.
Adding additional installer for audio resource thumbnail.
Merge pull request #212 from ngodfraind/master

Fixes raw install + video thumbnails + resource visibility
Making the plugin option event a mandatory event and a data conveyor for having error if event not implemented
Merge pull request #213 from maxailloud/plugin-option-event-mandatory

Making the plugin option event a mandatory event
Adding flashbox on plugin list
Merge pull request #214 from maxailloud/adding-flashbox-plugin-list

Adding flashbox on plugin list
Merge remote-tracking branch 'upstream/master'