TT Algebra 2

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Improvements to communication error messages
Fixed unavailable offline lessons on mobile devices
Fixed various bugs
Improvements to answer retention prior to submission
Improvements to enrollment setup
Improvements to Lessons-Per-Day setting
Improvements to artwork in several products
Fixed various content errors
Question updates and fixes
Ebook and Tutorial bugs and inconsistency fixes
Ebook updated highlight colors, and visual fixes
Fixes for lecture problems visual inconsistencies