(closes #3635) Change maintenance page
Merge pull request #667 from txiki31/3.2-integration

(closes #3635) Change maintenance page
force app AUTHENT if not defined (refs #3463)
Merge pull request #668 from Eric-Brison/3.2-I3636

force app AUTHENT if not defined (refs #3463)
Add SYSTEM tag to core applications (closes #3624)