[Improvement] Added support for multiple YubiKey devices per account
[Improvement] Added support for multiple YubiKey devices per account
[Improvement] Optimized response data for API calls displaying the component history
[Bug] Fixed issue when color hex codes are pasted into the theme design settings
[Bug] Fixed the All components and containers clickable text when creating a new incident
[Improvement] SMS subscriber validation is required for all new subscribers
[Improvement] Added ability to change CSS styles for subscriber links (RSS, iCalendar and Twitter)
[Improvement] All API errors are sent as JSON
[Bug] Fixed SMS unsubscribe issue causing some subscribers to remain listed as a subscriber
[Improvement] New notification subscribers automatically subscribe to updates for all new components and containers
[Improvement] Updated the variable names for plain-text mail notification templates
[Bug] Fixed bug calculating incorrect days until next maintenance
[Improvement] Split up the HTML head and body for custom code
[Bug] Fixed bug when displaying invoices