Fix modals in "Sayings"

The modals here show HTML code: https://ahiqar.sub.uni-goettingen.de/sayings.html But they should look like the modals here: https://ahiqar.sub.uni-goettingen.de/proverbs.html

For some reason, Vue inserts unwanted <pre> tags around the HTML on the first page, but not the second one.

@paul.pestov Do you know why this happens?

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