No more foreign key between admin_mailbox and admin_quota.

see #603
Translations update.
I forgot the migration :p

see #603
Few fixes.

fix #603
Don't forget the "rename domain" case.

see #603
Merge branch '1.1.x'
Merge branch 'master' into Toc-Toc-update-template-585
Mailbox tree fixed.

see #585