before starting feature #2845, cleaning some Java warnings...
closing feature #2845
now, files can be attached to messages
integrating fixes of bug #4468
on feature #2845, deleting all files when a message is deleted
fixing bug #1530
preventing exception in Kmelia when a file is updated/deleted into another application
Merge branch 'feature-2845' of https://github.com/NicolasEYSSERIC/Silverpeas-Components into feature_2845
feature #2845 : Fixing multilang problem
Fixing incorrect reload page url after creating a new message