Bug #5329 - modifying WYSIWYG controller to register the right file name according to the language content. (Wiring also the wysiwyg purge treatment)

Please don't forget to check the PR https://github.com/Silverpeas/Silverpeas-Components/pull/308.

Must be integrated after the following PR:
- https://github.com/Silverpeas/Silverpeas-setup/pull/17
- https://github.com/Silverpeas/Silverpeas-Core/pull/513