Since we're now allowing <h2> and <h3> tags in the description, we
remove the broken <h3> tag from quiz-question class. Since its content
is also in the <title> element, and in order to be consistent with other
show actions in the public area, we change this tag to <h1>.
We add <h2> tag in the "Share" heading and we replace the broken <h4>
tag above adding new styles.
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