Resolve "Fix info button bar while scrolling"

Closes #67

See merge request arsnova/cards!99

Delete card: Attempt to fix cards not displaying after confirm and resize the card after each content render event

Merge branch '53-hitting-return-key-in-a-one-line-text-field-should-have-the-same-effect-as-hitting-the-tab-key' into 'staging'

Resolve "Hitting RETURN key in a one-line text field should have the same effect as hitting the TAB key"

Closes #53

See merge request arsnova/cards!93

Merge branch '68-remove-screenfull-js-and-update-the-fullscreen-api-to-support-the-recent-chrome-versions' into 'staging'

Resolve "Update screenfull.js to 3.3.3"

Closes #68

See merge request arsnova/cards!92

Merge branch '51-display-beolingus-and-deepl-edge-buttons-in-the-presentation-and-when-learning-cards' into 'staging'

Resolve "Display Beolingus and DeepL edge buttons in the presentation and when learning cards"

Closes #51

See merge request arsnova/cards!91

Resolve "Visualize the states of the two buttons "Filter" and "Cloud"."

Closes #52

See merge request arsnova/cards!90

Resolve "Display number of cards in the description of a cloud item"

Closes #57

See merge request arsnova/cards!89