Fix 'unable to download videos' error, due to recent Youtube changes
● Fix error because of missing channel banner/avatar
● Fix crash happening, when SponsorBlock was not enabled when video was downloaded, however enabled later
● Fix missing context menu items.
● Refactor to use the latest NewPipe playlist fecthing code
● update style of screenshots - Tomoya Kuroda
● Updated translations for:
◎ Czech - Woyta, Not Fill
◎ Chinese (Simplified) - Eric
◎ French - Ninjdai
◎ German - RandomModderJDK
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