Resolve "PHP8-Warnungen"

Closes #288

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• 39e27a71 - prevent php8 warnings

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assigned to @tleilax

requested review from @elmar

marked this merge request as ready

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• 824ad5b5 - prevent another warning

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resolved all threads

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• b7021183 - Apply 1 suggestion(s) to 1 file(s)

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• 4f6cedc2 - prevent warning in cloze exercise

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• 457d2086 - prevent another warning in cloze solve view

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• 768defef - prevent warning in correction view for tb exercise

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• f27bcbd3 - prevent warnings in lt exercise

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• 8f5bc299 - prevent more php warnings

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