various small fixes
- fix infoleak in UserWebappList
- add user-friendly messages when connecting to the sandbox
- hide the job creation form when the app has no versions
- fix license
Prochaines maintenances programmées: lundi 06/05, lundi 03/06, lundi 01/07
Pour plus d'informations: https://doc-si.inria.fr/display/SU/Gitlab