Enable customized "start where you left off" screen

Please see attached image. LMS sites need to customize the "start where you left off" screen with their own branding, links to help, etc. to provide a professional and polished look, feel, and function. Additionally please add text to back-end language manager for customization.

Shika really looks awesome! Great job on raising the bar for how a focused extension can be seated in the Joomla platform in an aesthetic and functional win!