In some places, we accidentally opened the same tag twice instead of
closing it, while in some other places we closed a tag without opening
it in the first place.
We've detected these issues thanks to the HTML Beautifier gem, which
we're about to start using for indentation purposes.
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.
Remove unnecessary span class "debate-comments".
We take advantage of this commit to also unify the format of the date
that appears next to the comments with the rest of the application. The
format that we removed is being used on the same page in the
"Participation phases" tab (I guess that was the reason for putting it
the same) but I think it makes more sense to use the date format that is
used in this kind section in the rest of the application.
This message is only shown in the `show` action, so it's shown at most
once in the whole page, so it doesn't take up too much space and it
isn't as overwhelming as if we were showing it on the index page, once
per debate.
We're only showing it when there are closed options, though, since
there's already a message to sign in to comment when the question
accepts open answers.
Sometimes we're interpolating a link inside a translation, and marking
the whole translations as HTML safe.
However, some translations added by admins to the database or through
crowdin are not entirely under our control.
Although AFAIK crowdin checks for potential cross-site scripting
attacks, it's a good practice to sanitize parts of a string potentially
out of our control before marking the string as HTML safe.
