A11Y: Show focus state visibly
⚠️ **contains issues that are also mentioned in #136.
Wait for #136 to be resolved and check what has already been solved.**
Description
Autofocus
For modals and other elements that open in a different place in the dom hierarchy the auto-focus must be set programatically.
Make focus visible
https://www.w3.org/TR/WCAG20/#understandable https://www.w3.org/TR/WCAG20/#consistent-behavior
Todo
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[ ] Videos cannot be focused

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[ ] Unselected payment options are not focusable

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[ ] Auto focus Audio Player when starting a track (Befund 47 & 52)

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[ ] Focused actionbar item must be visible selected

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[ ] Auto focus must be set when the series-overview overlay is opened in an article.

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[ ] Modals must be autofocus when opened (will require changes in Styleguide)

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[ ] Autofocus image light-box
