Zendora: Hybrid Learning App

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New Features:
- Integrate Sentry for better error reporting
- Updated some assets to be higher resolution
- Added english in statistics, optimised statistics
- optimised feature level unlocking/newsletter
- lesson videos can now be fast forwarded if watched once

Bugfixes:
- overall ui bugfixes
- mission challenge navigation fixed
- fixed some animations not playing correctly
- fixed login token not persisting
- fixed english quiz navigation/ level jump