Fixed: menu was not shown on responsive mode because it wasn't a component refresh criteria
Improved/Fixed: selected mailbox handling
Fixed: mailbox fields were not set in config form
 action also retrieves imap folders when not present (fix a bug when the page directly loads, the imap folders weren't always retrieved)
Fixed: menu left-border's color on mouseover was incorrect
Improved: comment
Added: mailbox submenu is now made of some imap folders
Improved: fixtures