Release v6.12.9

• [chnage-log]
• [enhancement] task status will be set to overdue when it crosses expected end date
• [fix] validate that Item's website image is public
• [fix] Payment days calculation in salary slip
• [minor] lang fixes for email digest
• [translations] for #4461
• [fix] setup wizard is_private
• [fix] Reload SO Item in patch