OO-1739: backport the delete button in file element and use it in user profil for the avatar, in the resource description and in the catalog entry editor

OO-1561 replace lang parameter in pwd change and registration email with language parameter to not collide with html entity ⟨

OO-1341; make the extension of the image mandatory, needed by the java scaling service to discover the type of the image

OO-1278: the change executor must be the first in the chain of login interceptors (it don't need any GUI)

OO-1181: fix some issues with the ordering of the user property across different groups and prevent properties to disappear

OO-1068: split profile in two segments for the profile itself and the home page settings, add a preview, merge the profile and the portrait in the same controller

OO-1068 OO-1067 flexi form refactoring towards bootstrap, implement default layouts, further simplify DOM

--HG--
branch : bps