Merge branch 'release-2.20.0' into develop
Building new 2.21
fix piwik include code
LMLAB-416 Création d'un site: cliquer plusieurs fois sur le bouton 'Valider' crée plusieurs fois le site
https://archidevlm.atlassian.net/browse/LMLAB-416
LMLAB-428  CKEditor - Images - Explorer le server - utiliser la vue thumbnail
https://archidevlm.atlassian.net/browse/LMLAB-428
fix theme Domi (topbar)
fix widget 'Mes actualités'
LMLAB-428  CKEditor - Images - Explorer le server - utiliser la vue thumbnail
https://archidevlm.atlassian.net/browse/LMLAB-428
US-438 : style hidden in page classeur
size of actions column into page classeur
US-425 : refresh ko on firefox for refreshing up - down widget
style popover
Assets: button to download blob + click on picture open a fancybox
too many confirmation dialogs
browser d'assets CKEditor - encodage URL
browser d'assets CKEditor - tri alphabetique + encodage URL + choix format image
Prepare release 2.21.0
Merge branch 'release-2.21.0'