Changes

In the release pipeline of the Silverpeas platform, enabled the build of
the docker image of Silverpeas for trial purpose.

bug #14543: translation in German instead of English

Bug #14475

Fix the vulnerability by ensuring the data of the events/event
occurrences are correctly encoded for the HTML rendering.

Ensures also notification messages in Silverpeas are also correctly
encoded for their HTML rendering.

Ramdomly, the integration test SelectionBasketItemDeletingIT fails
because the item to remove from the selection basket isn't found
although it should be present.
Because the cause can be the test context hasn't been completed before
the starting of the test, a delay between the context preparation and
the start of the test is added

Bug #14544

Fix the vulnerability by checking the user accessing an invitation is
related by it (he's one of the user related by the invitation)

Fix a bug in NodeDAO#storeRow in which the setting of the node id and of the instance id have been inversed in the update SQL request

bug #14549: popup window and labels adjustments done

In SilverpeasRole add a new constant, NONE, to replace the use of null for no role played by a user

bug #14549: popup window and labels adjustments done

In Kmelia:
* Take use of the new constant SilverpeasRole.NONE when the user hasn't
  anymore a role for a given folder for which specific rights have been
  set;
* When the user accesses again the application (the root folder of the
  application), the last accessed folder is reset and hence his role

Bug #14523

Now, when a classified ad isn't validated, it is not indexable. If a
validated classified ad is put in draft (for modification), then its
index is deleted. Index is created only for validated classfied ads.